Cobalt(II) carbonate

Cobalt(II) carbonate
Names
	IUPAC name Cobalt(II) carbonate
	Other names Cobaltous carbonate; cobalt(II) salt
Identifiers
CAS Number	513-79-1 ; 12602-23-2 (cobalt carbonate hydroxide) ;
3D model (JSmol)	Interactive image;
ChemSpider	10123 ;
ECHA InfoCard	100.007.428
PubChem CID	10565;
UNII	7H73A68FUV ; W58TNI7T29 (cobalt carbonate hydroxide) ;
CompTox Dashboard (EPA)	DTXSID7052151 ;
	InChI InChI=1S/CH2O3.Co/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2 Key: ZOTKGJBKKKVBJZ-UHFFFAOYSA-L ; InChI=1/CH2O3.Co/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2 Key: ZOTKGJBKKKVBJZ-NUQVWONBAB;
	SMILES C(=O)([O-])[O-].[Co+2];
Properties
Chemical formula	CoCO3
Molar mass	118.941 g/mol
Appearance	red-pink solid
Density	4.13 g/cm3
Melting point	427 °C (801 °F; 700 K) ; decomposes before melting to cobalt(II) oxide (anhydrous); 140 °C (284 °F; 413 K); decomposes (hexahydrate)
Solubility in water	0.000142 g/100 mL (20 °C)
Solubility product (Ksp)	1.0·10−10
Solubility	soluble in acid ; negligible in alcohol, methyl acetate ; insoluble in ethanol
Refractive index (nD)	1.855
Structure
Crystal structure	Rhombohedral (anhydrous) ; Trigonal (hexahydrate)
Thermochemistry
Std molar; entropy (S⦵298)	79.9 J/mol·K
Std enthalpy of; formation (ΔfH⦵298)	−722.6 kJ/mol
Gibbs free energy (ΔfG⦵)	-651 kJ/mol
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H315, H317, H319, H335, H351
Precautionary statements	P261, P280, P305+P351+P338
NFPA 704 (fire diamond)	2 0 0
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	640 mg/kg (oral, rats)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Cobalt(II) carbonate is the inorganic compound with the formula CoCO₃. This reddish paramagnetic solid is an intermediate in the hydrometallurgical purification of cobalt from its ores. It is an inorganic pigment, and a precursor to catalysts. Cobalt(II) carbonate also occurs as the rare red/pink mineral spherocobaltite.

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