Cobalt Chloride

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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.

Cobalt(II) chlorideIdentifiersPropertiesStructureHazardsRelated compounds

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

Cobalt Chloride