Cobalt(II) carbonate

Cobalt(II) carbonate
	Co2+ CO32−
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	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 pink 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.

Names
Co²⁺ CO₃²⁻

IUPAC name Cobalt(II) carbonate
Other names Cobaltous carbonate; cobalt(II) salt
Identifiers
CAS Number	513-79-1^Y 12602-23-2 (cobalt carbonate hydroxide)^Y
3D model (JSmol)	Interactive image
ChemSpider	10123^N
ECHA InfoCard	100.007.428
PubChem CID	10565
UNII	7H73A68FUV^Y W58TNI7T29 (cobalt carbonate hydroxide)^Y
CompTox Dashboard (EPA)	DTXSID7052151
InChI InChI=1S/CH2O3.Co/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2^N Key: ZOTKGJBKKKVBJZ-UHFFFAOYSA-L^N 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	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 (K_sp)	1.0·10⁻¹⁰
Solubility	soluble in acid negligible in alcohol, methyl acetate insoluble in ethanol
Refractive index (n_D)	1.855
Structure
Crystal structure	Rhombohedral (anhydrous) Trigonal (hexahydrate)
Thermochemistry
Std molar entropy (S^⦵₂₉₈)	79.9 J/mol·K
Std enthalpy of formation (Δ_fH^⦵₂₉₈)	−722.6 kJ/mol
Gibbs free energy (Δ_fG^⦵)	−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). N verify (what is ^YN ?) Infobox references