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Cobalt(II) chloride is an inorganic compound of cobalt and chloride, with the formula CoCl2. It is usually supplied as the hexahydrate CoCl2·6H2O, which is one of the most commonly used cobalt compounds in the laboratory.[1] The hexahydrate is deep purple in color, whereas the anhydrous form is sky blue. Because of the ease of the hydration/dehydration reaction, and the resulting color change, cobalt chloride is used as an indicator for water in desiccants. Niche uses include its role in organic synthesis and electroplating objects with cobalt metal. Cobalt(II) chloride gives a blue-green color in a flame.
| Anhydrous | Hexahydrate |
| IUPAC name[hide]Cobalt(II) chloride | |
| Other names[hide]Cobaltous chlorideCobalt dichloride | |
| CAS number | 7646-79-9 Y, 16544-92-6 (dihydrate)7791-13-1 (hexahydrate) |
| PubChem | 24288 |
| ChemSpider | 22708 Y |
| UNII | EVS87XF13W Y |
| EC number | 231-589-4 |
| UN number | 3288 |
| ChEBI | CHEBI:35696 Y |
| RTECS number | GF9800000 |
| Jmol-3D images | Image 1 |
| SMILES[show]Cl[Co]Cl | |
| InChI[show]InChI=1S/2ClH.Co/h2*1H;/q;;+2/p-2 YKey: GVPFVAHMJGGAJG-UHFFFAOYSA-L Y InChI=1/2ClH.Co/h2*1H;/q;;+2/p-2Key: GVPFVAHMJGGAJG-NUQVWONBAU | |
| Molecular formula | CoCl2 |
| Molar mass | 129.839 g/mol (anhydrous)165.87 g/mol (dihydrate)237.93 g/mol (hexahydrate) |
| Appearance | rose red crystals (hexahydrate)blue crystals (anhydrous) |
| Density | 3.356 g/cm3 (anhydrous)2.48 g/cm3 (dihydrate)1.92 g/cm3 (hexahydrate) |
| Melting point | 735 °C |
| Boiling point | 1049 °C |
| Solubility in water | 436 g/L (0 °C)450 g/L (7 °C)529 g/L (20 °C) |
| Solubility | soluble in acetone, ethanol, ether |
| Crystal structure | CdCl2 structure |
| Coordinationgeometry | Octahedral |
| MSDS | ICSC 0783 |
| EU Index | 027-004-00-5 |
| EU classification | Toxic (T)Carc. Cat. 2Dangerous forthe environment (N) |
| R-phrases | R49, R60, R22, R42/43, R68, R50/53 |
| S-phrases | S53, S45, S60, S61 |
| NFPA 704 | 020 |
| Flash point | Non-flammable |
| LD50 | 80 mg/kg |
| Other anions | Cobalt(II) fluorideCobalt(II) bromideCobalt(II) iodide |
| Other cations | Rhodium(III) chloride |