Term: Calcium carbonate

– Properties:
– Chemical formula: CaCO
– Molar mass: 100.0869 g/mol
– Appearance: Fine white powder or colorless crystals; chalky taste
– Odor: Odorless
– Density: 2.711 g/cm (calcite), 2.83 g/cm (aragonite)

– Melting and Boiling Points:
– Melting point: 1,339°C (2,442°F; 1,612K) (calcite), 825°C (1,517°F; 1,098K) (aragonite)
– Boiling point: Decomposes
– Solubility in water: 0.013 g/L (25 °C)
– Solubility product: 3.3×10
– Solubility in dilute acids: Soluble

– Acidity and Magnetic Susceptibility:
– Acidity (pH): 9.0
– Magnetic susceptibility: -3.82×10 /mol
– Refractive index: 1.59
– Data provided for materials at standard state (25°C [77°F], 100kPa)

– Uses:
– Common in rocks as calcite and aragonite
– Found in chalk, limestone, eggshells, and shells
– Used in agricultural lime
– Component of pearls and shellfish skeletons
– Materials with high calcium carbonate content are calcareous

– Other Information:
– Active ingredient in agricultural lime
– Chemical compound with versatile applications
– Key component in various natural substances
– Important role in geological formations
– Widely distributed in nature

Calcium carbonate (Wikipedia)

Calcium carbonate is a chemical compound with the chemical formula CaCO₃. It is a common substance found in rocks as the minerals calcite and aragonite, most notably in chalk and limestone, eggshells, gastropod shells, shellfish skeletons and pearls. Materials containing much calcium carbonate or resembling it are described as calcareous. Calcium carbonate is the active ingredient in agricultural lime and is produced when calcium ions in hard water react with carbonate ions to form 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.

Calcium carbonate

Calcium, Ca   Carbon, C   Oxygen, O
Names
IUPAC name Calcium carbonate
Other names Aragonite Calcite Chalk Lime Limestone Marble Oystershell 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 or colorless crystals; 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)
Boiling point	decomposes
Solubility in water	0.013 g/L (25 °C)
Solubility product (Ksp)	3.3×10−9
Solubility in dilute acids	soluble
Acidity (pKa)	9.0
Magnetic susceptibility (χ)	−3.82×10−5 cm3/mol
Refractive index (nD)	1.59
Structure
Crystal structure	Trigonal
Space group	32/m
Thermochemistry
Std molar entropy (S⦵298)	93 J/(mol·K)
Std enthalpy of formation (ΔfH⦵298)	−1207 kJ/mol
Pharmacology
ATC code	A02AC01 (WHO) A12AA04 (WHO)
Hazards
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)
Safety data sheet (SDS)	ICSC 1193
Related compounds
Other anions	Calcium bicarbonate
Other cations	Beryllium carbonate Magnesium carbonate Strontium carbonate Barium carbonate Radium carbonate Zinc carbonate Cadmium carbonate Lead(II) 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

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