Cobalt(II) carbonate
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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.[5] Cobalt(II) carbonate also occurs as the rare red/pink mineral spherocobaltite.[6]
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
Cobalt(II) carbonate | |
Other names
Cobaltous carbonate; cobalt(II) salt | |
Identifiers | |
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3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.007.428 |
PubChem CID |
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UNII |
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CompTox Dashboard (EPA) |
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Properties | |
CoCO3 | |
Molar mass | 118.941 g/mol |
Appearance | red-pink solid |
Density | 4.13 g/cm3 |
Melting point | 427 °C (801 °F; 700 K) [1] decomposes before melting to cobalt(II) oxide (anhydrous) 140 °C (284 °F; 413 K) decomposes (hexahydrate) |
0.000142 g/100 mL (20 °C)[2] | |
Solubility product (Ksp) |
1.0·10−10[3] |
Solubility | soluble in acid negligible in alcohol, methyl acetate insoluble in ethanol |
Refractive index (nD) |
1.855 |
Structure | |
Rhombohedral (anhydrous) Trigonal (hexahydrate) | |
Thermochemistry | |
Std molar entropy (S⦵298) |
79.9 J/mol·K[1] |
Std enthalpy of formation (ΔfH⦵298) |
−722.6 kJ/mol[1] |
Gibbs free energy (ΔfG⦵) |
-651 kJ/mol[1] |
Hazards | |
GHS labelling: | |
[4] | |
Warning | |
H302, H315, H317, H319, H335, H351[4] | |
P261, P280, P305+P351+P338[4] | |
NFPA 704 (fire diamond) | |
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).
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