Calcium Carbonate Vitamin C

Calcium Carbonate Vitamin C

Chemical compound

Calcium carbonate

Names
IUPAC name Calcium carbonate
Other names Aragonite; calcite; chalk; lime; limestone; marble; oyster; pearl
Identifiers
CAS Number	471-34-1 Y
3D model (JSmol)	Interactive image Interactive image
ChEBI	CHEBI:3311 Y
ChEMBL	ChEMBL1200539 N
ChemSpider	9708 Y
DrugBank	DB06724
ECHA InfoCard	100.006.765
EC Number	207-439-9
E number	E170 (colours)
KEGG	D00932 Y
PubChem CID	10112
RTECS number	FF9335000
UNII	H0G9379FGK Y
CompTox Dashboard (EPA)	DTXSID3036238
InChI InChI=1S/CH2O3.Ca/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2 Y Key: VTYYLEPIZMXCLO-UHFFFAOYSA-L Y InChI=1/CH2O3.Ca/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2 Key: VTYYLEPIZMXCLO-NUQVWONBAS
SMILES [Ca+2].[O-]C([O-])=O C(=O)([O-])[O-].[Ca+2]
Properties
Chemical formula	CaCO3
Molar mass	100.0869 g/mol
Appearance	Fine white powder; chalky taste
Odor	odorless
Density	2.711 g/cm3 (calcite) 2.83 g/cm3 (aragonite)
Melting point	1,339 °C (2,442 °F; 1,612 K) (calcite) 825 °C (1,517 °F; 1,098 K) (aragonite)[4] [5]
Boiling point	decomposes
Solubility in water	0.013 g/L (25 °C)[1] [2]
Solubility product (K sp)	3.3×10−9 [3]
Solubility in dilute acids	soluble
Acidity (pK a)	9.0
Magnetic susceptibility (χ)	−3.82×10−5 cm3/mol
Refractive index (n D)	1.59
Structure
Crystal structure	Trigonal
Space group	32/m
Thermochemistry
Std molar entropy (S o 298)	93 J·mol−1·K−1 [6]
Std enthalpy of formation (Δf H ⦵ 298)	−1207 kJ·mol−1 [6]
Pharmacology
ATC code	A02AC01 (WHO) A12AA04 (WHO)
Hazards
Safety data sheet	ICSC 1193
NFPA 704 (fire diamond)	0 0 0
Lethal dose or concentration (LD, LC):
LD50 (median dose)	6450 mg/kg (oral, rat)
NIOSH (US health exposure limits):
PEL (Permissible)	TWA 15 mg/m3 (total) TWA 5 mg/m3 (resp)[7]
Related compounds
Other anions	Calcium bicarbonate
Other cations	Beryllium carbonate Magnesium carbonate Strontium carbonate Barium carbonate Radium carbonate
Related compounds	Calcium sulfate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Nverify (what is Y N  ?)
Infobox references

Chemical compound

Crystal structure of calcite

Calcium carbonate is a chemical compound with the formula CaCO₃. It is a common substance found in rocks as the minerals calcite and aragonite (most notably as limestone, which is a type of sedimentary rock consisting mainly of calcite) and is the main component of eggshells, snail shells, seashells and pearls. Calcium carbonate is the active ingredient in agricultural lime and is created when calcium ions in hard water react with carbonate ions to create limescale. It has medical use as a calcium supplement or as an antacid, but excessive consumption can be hazardous and cause hypercalcemia and digestive issues.^[8]

Chemistry [edit]

Calcium carbonate shares the typical properties of other carbonates. Notably it

• reacts with acids, releasing carbon dioxide (technically speaking, carbonic acid, but that disintegrates quickly to CO₂ and H₂O):

CaCO₃(s) + 2 H⁺(aq) → Ca²⁺(aq) + CO₂(g) + H₂O(l)

• releases carbon dioxide upon heating, called a thermal decomposition reaction, or calcination (to above 840 °C in the case of CaCO₃), to form calcium oxide, commonly called quicklime, with reaction enthalpy 178 kJ/mol:

CaCO₃(s) → CaO(s) + CO₂(g)

Calcium carbonate reacts with water that is saturated with carbon dioxide to form the soluble calcium bicarbonate.

CaCO₃(s) + CO₂(g) + H₂O(l) → Ca(HCO₃)₂(aq)

This reaction is important in the erosion of carbonate rock, forming caverns, and leads to hard water in many regions.

An unusual form of calcium carbonate is the hexahydrate, ikaite, CaCO₃·6H₂O. Ikaite is stable only below 8 °C.

Preparation [edit]

The vast majority of calcium carbonate used in industry is extracted by mining or quarrying. Pure calcium carbonate (such as for food or pharmaceutical use), can be produced from a pure quarried source (usually marble).

Alternatively, calcium carbonate is prepared from calcium oxide. Water is added to give calcium hydroxide then carbon dioxide is passed through this solution to precipitate the desired calcium carbonate, referred to in the industry as precipitated calcium carbonate (PCC):^[9]

CaO + H₂O → Ca(OH)₂

Ca(OH)₂ + CO₂ → CaCO₃↓ + H₂O

Structure [edit]

The thermodynamically stable form of CaCO₃ under normal conditions is hexagonal β-CaCO₃ (the mineral calcite).^[10] Other forms can be prepared, the denser (2.83 g/cm³) orthorhombic λ-CaCO₃ (the mineral aragonite) and hexagonal μ-CaCO₃, occurring as the mineral vaterite.^[10] The aragonite form can be prepared by precipitation at temperatures above 85 °C; the vaterite form can be prepared by precipitation at 60 °C.^[10] Calcite contains calcium atoms coordinated by six oxygen atoms; in aragonite they are coordinated by nine oxygen atoms.^[10] The vaterite structure is not fully understood.^[11] Magnesium carbonate (MgCO₃) has the calcite structure, whereas strontium carbonate and barium carbonate (SrCO₃ and BaCO₃) adopt the aragonite structure, reflecting their larger ionic radii.^[10]

Occurrence [edit]

Geological sources [edit]

Calcite, aragonite and vaterite are pure calcium carbonate minerals. Industrially important source rocks which are predominantly calcium carbonate include limestone, chalk, marble and travertine.

Biological sources [edit]

Eggshells, snail shells and most seashells are predominantly calcium carbonate and can be used as industrial sources of that chemical.^[13] Oyster shells have enjoyed recent recognition as a source of dietary calcium, but are also a practical industrial source.^{[14] [15]} Dark green vegetables such as broccoli and kale contain dietarily significant amounts of calcium carbonate, but they are not practical as an industrial source.^[16]

[edit]

Beyond Earth, strong evidence suggests the presence of calcium carbonate on Mars. Signs of calcium carbonate have been detected at more than one location (notably at Gusev and Huygens craters). This provides some evidence for the past presence of liquid water.^{[17] [18]}

Geology [edit]

Surface precipitation of CaCO3 as tufa in Rubaksa, Ethiopia

Carbonate is found frequently in geologic settings and constitutes an enormous carbon reservoir. Calcium carbonate occurs as aragonite, calcite and dolomite as significant constituents of the calcium cycle. The carbonate minerals form the rock types: limestone, chalk, marble, travertine, tufa, and others.

In warm, clear tropical waters corals are more abundant than towards the poles where the waters are cold. Calcium carbonate contributors, including plankton (such as coccoliths and planktic foraminifera), coralline algae, sponges, brachiopods, echinoderms, bryozoa and mollusks, are typically found in shallow water environments where sunlight and filterable food are more abundant. Cold-water carbonates do exist at higher latitudes but have a very slow growth rate. The calcification processes are changed by ocean acidification.

Where the oceanic crust is subducted under a continental plate sediments will be carried down to warmer zones in the asthenosphere and lithosphere. Under these conditions calcium carbonate decomposes to produce carbon dioxide which, along with other gases, give rise to explosive volcanic eruptions.

Carbonate compensation depth [edit]

The carbonate compensation depth (CCD) is the point in the ocean where the rate of precipitation of calcium carbonate is balanced by the rate of dissolution due to the conditions present. Deep in the ocean, the temperature drops and pressure increases. Calcium carbonate is unusual in that its solubility increases with decreasing temperature.^[19] Increasing pressure also increases the solubility of calcium carbonate. The carbonate compensation depth can range from 4,000 to 6,000 meters below sea level.

Role in taphonomy [edit]

Calcium carbonate can preserve fossils through permineralization. Most of the vertebrate fossils of the Two Medicine Formation—a geologic formation known for its duck-billed dinosaur eggs—are preserved by CaCO₃ permineralization.^[20] This type of preservation conserves high levels of detail, even down to the microscopic level. However, it also leaves specimens vulnerable to weathering when exposed to the surface.^[20]

Trilobite populations were once thought to have composed the majority of aquatic life during the Cambrian, due to the fact that their calcium carbonate-rich shells were more easily preserved than those of other species,^[21] which had purely chitinous shells.

Uses [edit]

Construction [edit]

The main use of calcium carbonate is in the construction industry, either as a building material, or limestone aggregate for road building, as an ingredient of cement, or as the starting material for the preparation of builders' lime by burning in a kiln. However, because of weathering mainly caused by acid rain,^[22] calcium carbonate (in limestone form) is no longer used for building purposes on its own, but only as a raw primary substance for building materials.

Calcium carbonate is also used in the purification of iron from iron ore in a blast furnace. The carbonate is calcined in situ to give calcium oxide, which forms a slag with various impurities present, and separates from the purified iron.^[23]

In the oil industry, calcium carbonate is added to drilling fluids as a formation-bridging and filtercake-sealing agent; it is also a weighting material which increases the density of drilling fluids to control the downhole pressure. Calcium carbonate is added to swimming pools, as a pH corrector for maintaining alkalinity and offsetting the acidic properties of the disinfectant agent.^[24]

It is also used as a raw material in the refining of sugar from sugar beet; it is calcined in a kiln with anthracite to produce calcium oxide and carbon dioxide. This burnt lime is then slaked in fresh water to produce a calcium hydroxide suspension for the precipitation of impurities in raw juice during carbonatation.^[25]

Calcium carbonate in the form of chalk has traditionally been a major component of blackboard chalk. However, modern manufactured chalk is mostly gypsum, hydrated calcium sulfate CaSO₄·2H₂O. Calcium carbonate is a main source for growing biorock. Precipitated calcium carbonate (PCC), pre-dispersed in slurry form, is a common filler material for latex gloves with the aim of achieving maximum saving in material and production costs.^[26]

Fine ground calcium carbonate (GCC) is an essential ingredient in the microporous film used in diapers and some building films, as the pores are nucleated around the calcium carbonate particles during the manufacture of the film by biaxial stretching. GCC and PCC are used as a filler in paper because they are cheaper than wood fiber. In terms of market volume, GCC are the most important types of fillers currently used.^[27] Printing and writing paper can contain 10–20% calcium carbonate. In North America, calcium carbonate has begun to replace kaolin in the production of glossy paper. Europe has been practicing this as alkaline papermaking or acid-free papermaking for some decades. PCC used for paper filling and paper coatings is precipitated and prepared in a variety of shapes and sizes having characteristic narrow particle size distributions and equivalent spherical diameters of 0.4 to 3 micrometers.^{[ citation needed ]}

Calcium carbonate is widely used as an extender in paints,^[28] in particular matte emulsion paint where typically 30% by weight of the paint is either chalk or marble. It is also a popular filler in plastics.^[28] Some typical examples include around 15 to 20% loading of chalk in unplasticized polyvinyl chloride (uPVC) drainpipes, 5% to 15% loading of stearate-coated chalk or marble in uPVC window profile. PVC cables can use calcium carbonate at loadings of up to 70 phr (parts per hundred parts of resin) to improve mechanical properties (tensile strength and elongation) and electrical properties (volume resistivity).^{[ citation needed ]} Polypropylene compounds are often filled with calcium carbonate to increase rigidity, a requirement that becomes important at high usage temperatures.^[29] Here the percentage is often 20–40%. It also routinely used as a filler in thermosetting resins (sheet and bulk molding compounds)^[29] and has also been mixed with ABS, and other ingredients, to form some types of compression molded "clay" poker chips.^[30] Precipitated calcium carbonate, made by dropping calcium oxide into water, is used by itself or with additives as a white paint, known as whitewashing.^{[31] [32]}

Calcium carbonate is added to a wide range of trade and do it yourself adhesives, sealants, and decorating fillers.^[28] Ceramic tile adhesives typically contain 70% to 80% limestone. Decorating crack fillers contain similar levels of marble or dolomite. It is also mixed with putty in setting stained glass windows, and as a resist to prevent glass from sticking to kiln shelves when firing glazes and paints at high temperature.^{[33] [34] [35] [36] [37]}

In ceramic glaze applications, calcium carbonate is known as whiting,^[28] and is a common ingredient for many glazes in its white powdered form. When a glaze containing this material is fired in a kiln, the whiting acts as a flux material in the glaze. Ground calcium carbonate is an abrasive (both as scouring powder and as an ingredient of household scouring creams), in particular in its calcite form, which has the relatively low hardness level of 3 on the Mohs scale, and will therefore not scratch glass and most other ceramics, enamel, bronze, iron, and steel, and have a moderate effect on softer metals like aluminium and copper. A paste made from calcium carbonate and deionized water can be used to clean tarnish on silver.^[38]

Health and diet [edit]

500-milligram calcium supplements made from calcium carbonate

Calcium carbonate is widely used medicinally as an inexpensive dietary calcium supplement for gastric antacid^[39] (such as Tums). It may be used as a phosphate binder for the treatment of hyperphosphatemia (primarily in patients with chronic kidney failure). It is used in the pharmaceutical industry as an inert filler for tablets and other pharmaceuticals.^[40]

Calcium carbonate is used in the production of calcium oxide as well as toothpaste and has seen a resurgence as a food preservative and color retainer, when used in or with products such as organic apples.^[41]

Calcium carbonate is used therapeutically as phosphate binder in patients on maintenance haemodialysis. It is the most common form of phosphate binder prescribed, particularly in non-dialysis chronic kidney disease. Calcium carbonate is the most commonly used phosphate binder, but clinicians are increasingly prescribing the more expensive, non-calcium-based phosphate binders, particularly sevelamer.

Excess calcium from supplements, fortified food, and high-calcium diets can cause milk-alkali syndrome, which has serious toxicity and can be fatal. In 1915, Bertram Sippy introduced the "Sippy regimen" of hourly ingestion of milk and cream, and the gradual addition of eggs and cooked cereal, for 10 days, combined with alkaline powders, which provided symptomatic relief for peptic ulcer disease. Over the next several decades, the Sippy regimen resulted in kidney failure, alkalosis, and hypercalcaemia, mostly in men with peptic ulcer disease. These adverse effects were reversed when the regimen stopped, but it was fatal in some patients with protracted vomiting. Milk-alkali syndrome declined in men after effective treatments for peptic ulcer disease arose. Since the 1990s it has been most frequently reported in women taking calcium supplements above the recommended range of 1.2 to 1.5 grams daily, for prevention and treatment of osteoporosis,^{[42] [43]} and is exacerbated by dehydration. Calcium has been added to over-the-counter products, which contributes to inadvertent excessive intake. Excessive calcium intake can lead to hypercalcemia, complications of which include vomiting, abdominal pain and altered mental status.^[44]

As a food additive it is designated E170,^[45] and it has an INS number of 170. Used as an acidity regulator, anticaking agent, stabilizer or color it is approved for usage in the EU,^[46] USA^[47] and Australia and New Zealand.^[48] It is "added by law to all UK milled bread flour except wholemeal".^{[49] [50]} It is used in some soy milk and almond milk products as a source of dietary calcium; at least one study suggests that calcium carbonate might be as bioavailable as the calcium in cow's milk.^[51] Calcium carbonate is also used as a firming agent in many canned and bottled vegetable products.

Several calcium supplement formulations have been documented to contain the chemical element lead,^[52] posing a public health concern.^[53] Lead is commonly found in natural sources of calcium.^[52]

Agriculture and aquaculture [edit]

Agricultural lime, powdered chalk or limestone, is used as a cheap method for neutralising acidic soil, making it suitable for planting, also used in aquaculture industry for pH regulation of pond soil before initiating culture.^[54]

Household cleaning [edit]

Calcium carbonate is a key ingredient in many household cleaning powders like Comet and is used as a scrubbing agent.

Pollution mitigation [edit]

In 1989, a researcher, Ken Simmons, introduced CaCO₃ into the Whetstone Brook in Massachusetts.^[55] His hope was that the calcium carbonate would counter the acid in the stream from acid rain and save the trout that had ceased to spawn. Although his experiment was a success, it did increase the amount of aluminium ions in the area of the brook that was not treated with the limestone. This shows that CaCO₃ can be added to neutralize the effects of acid rain in river ecosystems. Currently calcium carbonate is used to neutralize acidic conditions in both soil and water.^{[56] [57] [58]} Since the 1970s, such liming has been practiced on a large scale in Sweden to mitigate acidification and several thousand lakes and streams are limed repeatedly.^[59]

Calcium carbonate is also used in flue gas desulfurisation applications eliminating harmful SO₂ and NO₂ emissions from coal and other fossil fuels burnt in large fossil fuel power stations.^[56]

Calcination equilibrium [edit]

Calcination of limestone using charcoal fires to produce quicklime has been practiced since antiquity by cultures all over the world. The temperature at which limestone yields calcium oxide is usually given as 825 °C, but stating an absolute threshold is misleading. Calcium carbonate exists in equilibrium with calcium oxide and carbon dioxide at any temperature. At each temperature there is a partial pressure of carbon dioxide that is in equilibrium with calcium carbonate. At room temperature the equilibrium overwhelmingly favors calcium carbonate, because the equilibrium CO₂ pressure is only a tiny fraction of the partial CO₂ pressure in air, which is about 0.035 kPa.

At temperatures above 550 °C the equilibrium CO₂ pressure begins to exceed the CO₂ pressure in air. So above 550 °C, calcium carbonate begins to outgas CO₂ into air. However, in a charcoal fired kiln, the concentration of CO₂ will be much higher than it is in air. Indeed, if all the oxygen in the kiln is consumed in the fire, then the partial pressure of CO₂ in the kiln can be as high as 20 kPa.^[60]

The table shows that this partial pressure is not achieved until the temperature is nearly 800 °C. For the outgassing of CO₂ from calcium carbonate to happen at an economically useful rate, the equilibrium pressure must significantly exceed the ambient pressure of CO₂. And for it to happen rapidly, the equilibrium pressure must exceed total atmospheric pressure of 101 kPa, which happens at 898 °C.

Equilibrium pressure of CO₂ over CaCO₃ (P) versus temperature (T).^[61]

P (kPa)	0.055	0.13	0.31	1.80	5.9	9.3	14	24	34	51	72	80	91	101	179	901	3961
T (°C)	550	587	605	680	727	748	777	800	830	852	871	881	891	898	937	1082	1241

Solubility [edit]

With varying CO₂ pressure [edit]

Calcium carbonate is poorly soluble in pure water (47 mg/L at normal atmospheric CO₂ partial pressure as shown below).

The equilibrium of its solution is given by the equation (with dissolved calcium carbonate on the right):

CaCO3 ⇌ Ca2+ + CO 2− 3

K sp = 3.7×10−9 to 8.7×10−9 at 25 °C

where the solubility product for [Ca²⁺][CO ²⁻
₃ ] is given as anywhere from K _sp = 3.7×10⁻⁹ to K _sp = 8.7×10⁻⁹ at 25 °C, depending upon the data source.^{[61] [62]} What the equation means is that the product of molar concentration of calcium ions (moles of dissolved Ca²⁺ per liter of solution) with the molar concentration of dissolved CO ²⁻
₃ cannot exceed the value of K _sp. This seemingly simple solubility equation, however, must be taken along with the more complicated equilibrium of carbon dioxide with water (see carbonic acid). Some of the CO ²⁻
₃ combines with H⁺ in the solution according to

HCO − 3 ⇌ H+ + CO 2− 3

K a2 = 5.61×10−11 at 25 °C

HCO ⁻
₃ is known as the bicarbonate ion. Calcium bicarbonate is many times more soluble in water than calcium carbonate—indeed it exists only in solution.

Some of the HCO ⁻
₃ combines with H⁺ in solution according to

H2CO3 ⇌ H+ + HCO − 3

K a1 = 2.5×10−4 at 25 °C

Some of the H₂CO₃ breaks up into water and dissolved carbon dioxide according to

H2O + CO2(aq) ⇌ H2CO3

K h = 1.70×10−3 at 25 °C

And dissolved carbon dioxide is in equilibrium with atmospheric carbon dioxide according to

${\displaystyle {\frac {P_{{\ce {CO2}}}}{[{\ce {CO2}}]}}\ =\ k_{{\ce {H}}}}$

where k H = 29.76 atm/(mol/L) at 25 °C (Henry constant), P CO2 being the CO2 partial pressure.

For ambient air, P _CO2 is around 3.5×10⁻⁴ atmospheres (or equivalently 35 Pa). The last equation above fixes the concentration of dissolved CO₂ as a function of P _CO2 , independent of the concentration of dissolved CaCO₃. At atmospheric partial pressure of CO₂, dissolved CO₂ concentration is 1.2×10⁻⁵ moles per liter. The equation before that fixes the concentration of H₂CO₃ as a function of CO₂ concentration. For [CO₂] = 1.2×10⁻⁵ , it results in [H₂CO₃] = 2.0×10⁻⁸ moles per liter. When [H₂CO₃] is known, the remaining three equations together with

Calcium ion solubility as a function of CO₂ partial pressure at 25 °C (K _sp = 4.47×10⁻⁹ )

P CO2 (atm)	pH	[Ca2+] (mol/L)
10−12	12.0	5.19×10−3
10−10	11.3	1.12×10−3
10−8	10.7	2.55×10−4
10−6	9.83	1.20×10−4
10−4	8.62	3.16×10−4
3.5×10−4	8.27	4.70×10−4
10−3	7.96	6.62×10−4
10−2	7.30	1.42×10−3
10−1	6.63	3.05×10−3
1	5.96	6.58×10−3
10	5.30	1.42×10−2

H2O ⇌ H+ + OH−

K = 10−14 at 25 °C

(which is true for all aqueous solutions), and the fact that the solution must be electrically neutral,

[Ca²⁺] + 2[H⁺] = [HCO ⁻
₃ ] + [CO ²⁻
₃ ] + [OH⁻]

make it possible to solve simultaneously for the remaining five unknown concentrations (note that the above form of the neutrality equation is valid only if calcium carbonate has been put in contact with pure water or with a neutral pH solution; in the case where the initial water solvent pH is not neutral, the equation is modified).

The adjacent table shows the result for [Ca²⁺] and [H⁺] (in the form of pH) as a function of ambient partial pressure of CO₂ (K _sp = 4.47×10⁻⁹ has been taken for the calculation).

• At atmospheric levels of ambient CO₂ the table indicates that the solution will be slightly alkaline with a maximum CaCO₃ solubility of 47 mg/L.
• As ambient CO₂ partial pressure is reduced below atmospheric levels, the solution becomes more and more alkaline. At extremely low P _CO2 , dissolved CO₂, bicarbonate ion, and carbonate ion largely evaporate from the solution, leaving a highly alkaline solution of calcium hydroxide, which is more soluble than CaCO₃. Note that for P _CO2 = 10⁻¹² atm, the [Ca²⁺][OH⁻]² product is still below the solubility product of Ca(OH)₂ ( 8×10⁻⁶ ). For still lower CO₂ pressure, Ca(OH)₂ precipitation will occur before CaCO₃ precipitation.
• As ambient CO₂ partial pressure increases to levels above atmospheric, pH drops, and much of the carbonate ion is converted to bicarbonate ion, which results in higher solubility of Ca²⁺.

The effect of the latter is especially evident in day-to-day life of people who have hard water. Water in aquifers underground can be exposed to levels of CO₂ much higher than atmospheric. As such water percolates through calcium carbonate rock, the CaCO₃ dissolves according to the second trend. When that same water then emerges from the tap, in time it comes into equilibrium with CO₂ levels in the air by outgassing its excess CO₂. The calcium carbonate becomes less soluble as a result, and the excess precipitates as lime scale. This same process is responsible for the formation of stalactites and stalagmites in limestone caves.

Two hydrated phases of calcium carbonate, monohydrocalcite CaCO₃·H₂O and ikaite CaCO₃·6H₂O, may precipitate from water at ambient conditions and persist as metastable phases.

With varying pH, temperature and salinity: CaCO₃ scaling in swimming pools [edit]

In contrast to the open equilibrium scenario above, many swimming pools are managed by addition of sodium bicarbonate (NaHCO₃) to about 2 mM as a buffer, then control of pH through use of HCl, NaHSO₄, Na₂CO₃, NaOH or chlorine formulations that are acidic or basic. In this situation, dissolved inorganic carbon (total inorganic carbon) is far from equilibrium with atmospheric CO₂. Progress towards equilibrium through outgassing of CO₂ is slowed by

1. the slow reaction

   H₂CO₃ ⇌ CO₂(aq) + H₂O;^[63]

2. limited aeration in a deep water column; and
3. periodic replenishment of bicarbonate to maintain buffer capacity (often estimated through measurement of 'total alkalinity').

In this situation, the dissociation constants for the much faster reactions

H₂CO₃ ⇌ H⁺ + HCO ⁻
₃ ⇌ 2 H⁺ + CO ²⁻
₃

allow the prediction of concentrations of each dissolved inorganic carbon species in solution, from the added concentration of HCO ⁻
₃ (which constitutes more than 90% of Bjerrum plot species from pH 7 to pH 8 at 25 °C in fresh water).^[64] Addition of HCO ⁻
₃ will increase CO ²⁻
₃ concentration at any pH. Rearranging the equations given above, we can see that [Ca²⁺] = K _sp / [CO ²⁻
₃ ] , and [CO ²⁻
₃ ] = K _a2 [HCO ⁻
₃ ] / [H⁺] . Therefore, when HCO ⁻
₃ concentration is known, the maximum concentration of Ca²⁺ ions before scaling through CaCO₃ precipitation can be predicted from the formula:

${\displaystyle [{\ce {Ca^2+}}]_{\max }={\frac {K_{\mathrm {sp} }}{K_{\mathrm {a} 2}}}\times {\frac {[{\ce {H+}}]}{[{\ce {HCO3-}}]}}}$

The solubility product for CaCO₃ (K _sp) and the dissociation constants for the dissolved inorganic carbon species (including K _a2) are all substantially affected by temperature and salinity,^[64] with the overall effect that [Ca²⁺]_max increases from freshwater to saltwater, and decreases with rising temperature, pH, or added bicarbonate level, as illustrated in the accompanying graphs.

The trends are illustrative for pool management, but whether scaling occurs also depends on other factors including interactions with Mg²⁺, B(OH) ⁻
₄ and other ions in the pool, as well as supersaturation effects.^{[65] [66]} Scaling is commonly observed in electrolytic chlorine generators, where there is a high pH near the cathode surface and scale deposition further increases temperature. This is one reason that some pool operators prefer borate over bicarbonate as the primary pH buffer, and avoid the use of pool chemicals containing calcium.^[67]

Solubility in a strong or weak acid solution [edit]

Solutions of strong (HCl), moderately strong (sulfamic) or weak (acetic, citric, sorbic, lactic, phosphoric) acids are commercially available. They are commonly used as descaling agents to remove limescale deposits. The maximum amount of CaCO₃ that can be "dissolved" by one liter of an acid solution can be calculated using the above equilibrium equations.

• In the case of a strong monoacid with decreasing acid concentration [A] = [A⁻], we obtain (with CaCO₃ molar mass = 100 g/mol):

[A] (mol/L)	1	10−1	10−2	10−3	10−4	10−5	10−6	10−7	10−10
Initial pH	0.00	1.00	2.00	3.00	4.00	5.00	6.00	6.79	7.00
Final pH	6.75	7.25	7.75	8.14	8.25	8.26	8.26	8.26	8.27
Dissolved CaCO3 (g/L of acid)	50.0	5.00	0.514	0.0849	0.0504	0.0474	0.0471	0.0470	0.0470

where the initial state is the acid solution with no Ca²⁺ (not taking into account possible CO₂ dissolution) and the final state is the solution with saturated Ca²⁺. For strong acid concentrations, all species have a negligible concentration in the final state with respect to Ca²⁺ and A⁻ so that the neutrality equation reduces approximately to 2[Ca²⁺] = [A⁻] yielding [Ca²⁺] ≈ 1 / 2 [A⁻]. When the concentration decreases, [HCO ⁻
₃ ] becomes non-negligible so that the preceding expression is no longer valid. For vanishing acid concentrations, one can recover the final pH and the solubility of CaCO₃ in pure water.

• In the case of a weak monoacid (here we take acetic acid with pK _a = 4.76) with decreasing total acid concentration [A] = [A⁻] + [AH], we obtain:

[A] (mol/L)	1	10−1	10−2	10−3	10−4	10−5	10−6	10−7	10−10
Initial pH	2.38	2.88	3.39	3.91	4.47	5.15	6.02	6.79	7.00
Final pH	6.75	7.25	7.75	8.14	8.25	8.26	8.26	8.26	8.27
Dissolved CaCO3 (g/L of acid)	49.5	4.99	0.513	0.0848	0.0504	0.0474	0.0471	0.0470	0.0470

For the same total acid concentration, the initial pH of the weak acid is less acid than the one of the strong acid; however, the maximum amount of CaCO₃ which can be dissolved is approximately the same. This is because in the final state, the pH is larger than the pK _a, so that the weak acid is almost completely dissociated, yielding in the end as many H⁺ ions as the strong acid to "dissolve" the calcium carbonate.

• The calculation in the case of phosphoric acid (which is the most widely used for domestic applications) is more complicated since the concentrations of the four dissociation states corresponding to this acid must be calculated together with [HCO ⁻
  ₃ ], [CO ²⁻
  ₃ ], [Ca²⁺], [H⁺] and [OH⁻]. The system may be reduced to a seventh degree equation for [H⁺] the numerical solution of which gives

[A] (mol/L)	1	10−1	10−2	10−3	10−4	10−5	10−6	10−7	10−10
Initial pH	1.08	1.62	2.25	3.05	4.01	5.00	5.97	6.74	7.00
Final pH	6.71	7.17	7.63	8.06	8.24	8.26	8.26	8.26	8.27
Dissolved CaCO3 (g/L of acid)	62.0	7.39	0.874	0.123	0.0536	0.0477	0.0471	0.0471	0.0470

where [A] = [H₃PO₄] + [H
₂ PO ⁻
₄ ] + [HPO ²⁻
₄ ] + [PO ³⁻
₄ ] is the total acid concentration. Thus phosphoric acid is more efficient than a monoacid since at the final almost neutral pH, the second dissociated state concentration [HPO ²⁻
₄ ] is not negligible (see phosphoric acid).

See also [edit]

Electron micrograph of needle-like calcium carbonate crystals formed as limescale in a kettle

• Cuttlebone
• Cuttlefish
• Gesso
• Limescale
• Marble
• Ocean acidification
• Whiting event
• List of climate engineering topics
• Lysocline

References [edit]

1. ^ Aylward, Gordon; Findlay, Tristan (2008). SI Chemical Data Book (4th ed.). John Wiley & Sons Australia. ISBN978-0-470-81638-7.
2. ^ Rohleder, J.; Kroker, E. (2001). Calcium Carbonate: From the Cretaceous Period Into the 21st Century. Springer Science & Business Media. ISBN978-3-7643-6425-0.
3. ^ Benjamin, Mark M. (2002). Water Chemistry. McGraw-Hill. ISBN978-0-07-238390-4.
4. ^ "Occupational safety and health guideline for calcium carbonate" (PDF). US Dept. of Health and Human Services. Retrieved 31 March 2011.
5. ^ "Archived copy" (PDF). Archived from the original (PDF) on 29 October 2018. Retrieved 29 October 2018. CS1 maint: archived copy as title (link)
6. ^ ^{a b} Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A21. ISBN978-0-618-94690-7.
7. ^ NIOSH Pocket Guide to Chemical Hazards. "#0090". National Institute for Occupational Safety and Health (NIOSH).
8. ^ Strumińska-Parulska, DI (2015). "Determination of ²¹⁰Po in calcium supplements and the possible related dose assessment to the consumers". Journal of Environmental Radioactivity. 150: 121–125. doi:10.1016/j.jenvrad.2015.08.006. PMID 26318774.
9. ^ "Precipitated Calcium Carbonate". Archived from the original on 11 January 2014. Retrieved 11 January 2014.
10. ^ ^{a b c d e} Ropp, R. C. (6 March 2013). Encyclopedia of the Alkaline Earth Compounds. Elsevier. pp. 359–370. ISBN9780444595508.
11. ^ Demichelis, Raffaella; Raiteri, Paolo; Gale, Julian D.; Dovesi, Roberto (2013). "The Multiple Structures of Vaterite". Crystal Growth & Design. 13 (6): 2247–2251. doi:10.1021/cg4002972. ISSN 1528-7483.
12. ^ Russell, Daniel E . 17 February 2008. Retrieved December 31, 2010. "Helgustadir Iceland Spar Mine" mindat.org
13. ^ Horne, Francis (23 October 2006). "How are seashells created?". Scientific American . Retrieved 25 April 2012.
14. ^ "Oyster shell calcium". WebMD . Retrieved 25 April 2012.
15. ^ "Oyster Shell Calcium Carbonate". Caltron Clays & Chemicals. Archived from the original on 10 September 2013. Retrieved 25 April 2012.
16. ^ Mangels, Ann Reed (4 June 2014). "Bone nutrients for vegetarians". The American Journal of Clinical Nutrition. 100 (1): 469S–475S. doi:10.3945/ajcn.113.071423. PMID 24898231.
17. ^ Boynton, W. V.; Ming, D. W.; Kounaves, S. P.; et al. (2009). "Evidence for Calcium Carbonate at the Mars Phoenix Landing Site" (PDF). Science. 325 (5936): 61–64. Bibcode:2009Sci...325...61B. doi:10.1126/science.1172768. PMID 19574384. S2CID 26740165.
18. ^ Clark, B. C., III; Arvidson, R. E.; Gellert, R.; et al. (2007). "Evidence for montmorillonite or its compositional equivalent in Columbia Hills, Mars" (PDF). Journal of Geophysical Research. 112 (E6): E06S01. Bibcode:2007JGRE..112.6S01C. doi:10.1029/2006JE002756. hdl:1893/17119.
19. ^ Weyl, P.K. (1959). "The change in solubility of calcium carbonate with temperature and carbon dioxide content". Geochimica et Cosmochimica Acta. 17 (3–4): 214–225. Bibcode:1959GeCoA..17..214W. doi:10.1016/0016-7037(59)90096-1.
20. ^ ^{a b} Trexler, D. (2001). "Two Medicine Formation, Montana: geology and fauna". In Tanke, D. H.; Carpenter, K. (eds.). Mesozoic Vertebrate Life. Indiana University Press. pp. 298–309. ISBN978-0-253-33907-2.
21. ^ Ward, Peter (2006). Out of Thin Air: Dinosaurs, Birds, and Earth's Ancient Atmosphere. doi:10.17226/11630. ISBN9780309666121.
22. ^ "Effects of Acid Rain". US Environmental Protection Agency. Retrieved 14 March 2015.
23. ^ "Blast Furnace". Science Aid. Archived from the original on 17 December 2007. Retrieved 30 December 2007.
24. ^ Sfetcu, Nicolae (2 May 2014). Health & Drugs: Disease, Prescription & Medication. Nicolae Sfetcu.
25. ^ McGinnis, R. A. Beet-Sugar Technology (2nd ed.). Beet Sugar Development Foundation. p. 178.
26. ^ "Precipitated Calcium Carbonate uses". Archived from the original on 25 July 2014.
27. ^ "Market Study Fillers, 2nd ed". Ceresana. September 2011.
28. ^ ^{a b c d} "Calcium Carbonate Powder". Reade Advanced Materials. 4 February 2006. Archived from the original on 22 February 2008. Retrieved 30 December 2007.
29. ^ ^{a b} "Calcium carbonate in plastic applications". Imerys Performance Minerals. Archived from the original on 4 August 2008. Retrieved 1 August 2008.
30. ^ "Why do calcium carbonate play an important part in Industrial". www.xintuchemical.com . Retrieved 7 October 2018.
31. ^ "precipitated calcium carbonate commodity price". www.dgci.be. Archived from the original on 7 October 2018. Retrieved 7 October 2018.
32. ^ Jimoh, O.A.; et al. (2017). "Understanding the Precipitated Calcium Carbonate (PCC) Production Mechanism and Its Characteristics in the Liquid–Gas System Using Milk of Lime (MOL) Suspension" (PDF). South African Journal of Chemistry. 70: 1–7. doi:10.17159/0379-4350/2017/v70a1.
33. ^ "Topic: Re: Can our calcium carbonate "waste" be utilized in other industries so we can divert it from landfills?". www.chemicalprocessing.com. 4 March 2010. Retrieved 3 February 2021.
34. ^ "Why do calcium carbonate play an important part in Industry?". www.xintuchemical.com . Retrieved 3 February 2021.
35. ^ "Calcium_carbonate". www.chemeurope.com . Retrieved 3 February 2021.
36. ^ "Calcium Carbonates / Calcite/ Limestone. CaCO3 | Rajasthan Minerals & Chemicals". www.rmcl.co.in. Archived from the original on 15 April 2021. Retrieved 3 February 2021.
37. ^ "Calcium Carbonate". kamceramics.com . Retrieved 3 February 2021.
38. ^ "Ohio Historical Society Blog: Make It Shine". Ohio Historical Society. Archived from the original on 23 March 2012. Retrieved 2 June 2011.
39. ^ "Calcium Carbonate". Medline Plus. National Institutes of Health. 1 October 2005. Archived from the original on 17 October 2007. Retrieved 30 December 2007.
40. ^ Lieberman, Herbert A.; Lachman, Leon; Schwartz, Joseph B. (1990). Pharmaceutical Dosage Forms: Tablets . New York: Dekker. p. 153. ISBN978-0-8247-8044-9.
41. ^ "Food Additives – Names Starting with C". Chemistry.about.com. 10 April 2012. Archived from the original on 16 October 2006. Retrieved 24 May 2012.
42. ^ Caruso JB, Patel RM, Julka K, Parish DC (July 2007). "Health-behavior induced disease: return of the milk-alkali syndrome". J Gen Intern Med. 22 (7): 1053–5. doi:10.1007/s11606-007-0226-0. PMC2219730. PMID 17483976.
43. ^ Beall DP, Henslee HB, Webb HR, Scofield RH (May 2006). "Milk-alkali syndrome: a historical review and description of the modern version of the syndrome". Am. J. Med. Sci. 331 (5): 233–42. doi:10.1097/00000441-200605000-00001. PMID 16702792. S2CID 45802184.
44. ^ Gabriely, Ilan; Leu, James P.; Barzel, Uriel S. (2008). "Clinical problem-solving, back to basics". New England Journal of Medicine. 358 (18): 1952–6. doi:10.1056/NEJMcps0706188. PMID 18450607.
45. ^ "E-numbers: E170 Calcium carbonate". Food-Info.net. 080419 food-info.net
46. ^ "Current EU approved additives and their E Numbers". UK Food Standards Agency. Retrieved 27 October 2011.
47. ^ "Listing of Food Additives Status Part I". US Food and Drug Administration. Archived from the original on 14 March 2013. Retrieved 27 October 2011.
48. ^ "Standard 1.2.4 – Labelling of ingredients". Australia New Zealand Food Standards Code. Retrieved 27 October 2011.
49. ^ Holdstock, Lee. "Why go organic?". Real Bread Campaign. Soil Association Certification Limited. Retrieved 3 April 2021.
50. ^ "Bread and Flour Regulations 1998 A summary of responses to the consultation and Government Reply" (PDF). Department for Environment, Food and Rural Affairs. August 2013.
51. ^ Zhao, Y.; Martin, B. R.; Weaver, C. M. (2005). "Calcium bioavailability of calcium carbonate fortified soymilk is equivalent to cow's milk in young women". The Journal of Nutrition. 135 (10): 2379–2382. doi:10.1093/jn/135.10.2379. PMID 16177199.
52. ^ ^{a b} Kauffman, John F.; Westenberger, Benjamin J.; Robertson, J. David; Guthrie, James; Jacobs, Abigail; Cummins, Susan K. (1 July 2007). "Lead in pharmaceutical products and dietary supplements". Regulatory Toxicology and Pharmacology. 48 (2): 128–134. doi:10.1016/j.yrtph.2007.03.001. ISSN 0273-2300. PMID 17467129.
53. ^ Ross, Edward A.; Szabo, N. J.; Tebbett, I. R. (2000). "Lead Content of Calcium Supplements". JAMA. 284 (11): 1425–1429. doi:10.1001/jama.284.11.1425. PMID 10989406.
54. ^ Oates, J. A. H. (11 July 2008). Lime and Limestone: Chemistry and Technology, Production and Uses. John Wiley & Sons. pp. 111–113. ISBN978-3-527-61201-7.
55. ^ "Limestone Dispenser Fights Acid Rain in Stream". The New York Times. Associated Press. 13 June 1989.
56. ^ ^{a b} "Environmental Uses for Calcium Carbonate". Congcal. 6 September 2012. Retrieved 5 August 2013.
57. ^ Schreiber, R. K. (1988). "Cooperative federal-state liming research on surface waters impacted by acidic deposition". Water, Air, & Soil Pollution. 41 (1): 53–73. Bibcode:1988WASP...41...53S. doi:10.1007/BF00160344. S2CID 98404326.
58. ^ Kircheis, Dan; Dill, Richard (2006). "Effects of low pH and high aluminum on Atlantic salmon smolts in Eastern Maine and liming project feasibility analysis" (reprinted at Downeast Salmon Federation). National Marine Fisheries Service and Maine Atlantic Salmon Commission. ^{[ permanent dead link ]}
59. ^ Guhrén, M.; Bigler, C.; Renberg, I. (2006). "Liming placed in a long-term perspective: A paleolimnological study of 12 lakes in the Swedish liming program". Journal of Paleolimnology. 37 (2): 247–258. Bibcode:2007JPall..37..247G. doi:10.1007/s10933-006-9014-9. S2CID 129439066.
60. ^ "Solvay Precipitated Calcium Carbonate: Production". Solvay. 9 March 2007. Retrieved 30 December 2007.
61. ^ ^{a b} Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press. ISBN0-8493-0486-5.
62. ^ "Selected Solubility Products and Formation Constants at 25 °C". California State University, Dominguez Hills.
63. ^ Wang, X.; Conway, W.; Burns, R.; McCann, N.; Maeder, M. (2010). "Comprehensive Study of the Hydration and Dehydration Reactions of Carbon Dioxide in Aqueous Solution". The Journal of Physical Chemistry A. 114 (4): 1734–40. Bibcode:2010JPCA..114.1734W. doi:10.1021/jp909019u. PMID 20039712.
64. ^ ^{a b} Mook, W. (2000). "Chemistry of carbonic acid in water". Environmental Isotopes in the Hydrological Cycle: Principles and Applications (PDF). Paris: INEA/UNESCO. pp. 143–165. Archived from the original (PDF) on 18 March 2014. Retrieved 18 March 2014.
65. ^ Wojtowicz, J. A. (1998). "Factors affecting precipitation of calcium carbonate" (PDF). Journal of the Swimming Pool and Spa Industry. 3 (1): 18–23. Archived from the original (PDF) on 18 March 2014. Retrieved 18 March 2014.
66. ^ Wojtowicz, J. A. (1998). "Corrections, potential errors, and significance of the saturation index" (PDF). Journal of the Swimming Pool and Spa Industry. 3 (1): 37–40. Archived from the original (PDF) on 24 August 2012. Retrieved 18 March 2014.
67. ^ Birch, R. G. (2013). "BABES: a better method than "BBB" for pools with a salt-water chlorine generator" (PDF). scithings.id.au.

External links [edit]

• International Chemical Safety Card 1193
• CID 516889 from PubChem
• ATC codes: A02AC01 (WHO) and A12AA04 (WHO)
• The British Calcium Carbonate Association – What is calcium carbonate
• CDC – NIOSH Pocket Guide to Chemical Hazards – Calcium Carbonate

Calcium Carbonate Vitamin C

Source: https://en.wikipedia.org/wiki/Calcium_carbonate