Calcium carbonate

Calcium carbonate
Names
IUPAC name
Calcium carbonate
Other names
Identifiers
  • 471-34-1 Y
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
DrugBank
ECHA InfoCard 100.006.765
EC Number
  • 207-439-9
E number E170 (colours)
KEGG
RTECS number
  • FF9335000
UNII
  • 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
  • [Ca+2].[O-]C([O-])=O
  • C(=O)([O-])[O-].[Ca+2]
Properties
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)[1][2]
Boiling point decomposes
0.013 g/L (25 °C)[3][4]
3.3×10−9[5]
Solubility in dilute acids soluble
Acidity (pKa) 9.0
−3.82×10−5 cm3/mol
1.59
Structure
Trigonal
32/m
Thermochemistry
93 J·mol−1·K−1[6]
−1207 kJ·mol−1[6]
Pharmacology
A02AC01 (WHO) A12AA04 (WHO)
Hazards
Safety data sheet ICSC 1193
NFPA 704 (fire diamond)
0
0
0
Lethal dose or concentration (LD, LC):
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).
N verify (what is YN ?)
Infobox references
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]