Calcium Carbonate
Title: Calcium Carbonate
CAS Registry Number: 471-34-1
CAS Name: Carbonic acid calcium salt (1:1)
Trademarks: Cacit (Norwich); Calcichew (Shire); Calcidia (Roche); Caltrate (Wyeth); Citrical (Shire); Fixical (Pharmascience); Maalox Quick Dissolve (Novartis); Maalox Regular Strength (Novartis); Os-Cal (GSK); Tums Smooth Dissolve (GSK)
Molecular Formula: CCaO3
Molecular Weight: 100.09
Percent Composition: C 12.00%, Ca 40.04%, O 47.96%
Line Formula: CaCO3
Literature References: Exists in nature as the minerals aragonite, calcite and vaterite. Solubility and scale formation study: J.-Y. Gal et al., Talanta 43, 1497 (1996). Clinical evaluation in protease inhibitor-induced diarrhea in HIV: M. J. Turner et al., HIV Clin. Trials 5, 19 (2004). Review of commercial applications in paints, coatings and adhesives: R. D. Athey, Eur. Coatings J. 5, 256-263 (1994).
Properties: Odorless, tasteless powder or crystals. Two crystal forms are of commercial importance: Aragonite, orthorhombic, mp 825° (dec), d 2.83, formed at temps above 30°; Calcite, hexagonal-rhombohedral, mp 1339° (102.5 atm), d25.2 2.711, formed at temps below 30°. At about 825° is dec into CaO and CO2. Practically insol in water. Sol in dil acids.
Melting point: mp 825° (dec); mp 1339° (102.5 atm)
Density: d 2.83; d25.2 2.711
 
Derivative Type: Precipitated calcium carbonate
Additional Names: Precipitated chalk
Trademarks: Aeromatt; Albacar; Purecal (Wyandotte)
Properties: Commercial CaCO3 produced by chemical means. It is 98-99% pure. The byproduct process, the carbonation process, and the calcium chloride process of manuf from limestone are outlined in Kirk-Othmer Encyclopedia of Chemical Technology vol. 4 (Interscience, New York, 2nd ed., 1964) pp 7-11. Review: Woerner in Pigment Handbook vol. 1, T. C. Patton, Ed. (John Wiley, New York, 1973) pp 119-128.
 
Derivative Type: Prepared calcium carbonate
Additional Names: Drop chalk; prepared chalk; whiting; English white; Paris white
Properties: Native CaCO3 purified by elutriation.
 
CAUTION: Potential symptoms of overexposure are irritation of eyes, skin, respiratory system; cough. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 46.
Use: Manuf of paint, rubber, plastics, paper, dentifrices, ceramics, putty, polishes, insecticides, inks, shoe dressings; as a filler in production of adhesives, matches, pencils; crayons, linoleum, insulating compds, welding rods. In foods, cosmetics, pharmaceuticals, antibiotics; removing acidity of wines. In anal. chem for detecting and determining halogens in organic combinations; with NH4Cl for decomposing silicates; preparing CaCl2 soln for standardizing soap solns; for water analyses.
Therap-Cat: Antacid. Calcium supplement.
Therap-Cat-Vet: Antacid, calcium supplement, antidiarrheal agent.
Keywords: Antacid; Replenishers/Supplements; Calcium.

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