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Cobalt Chloride
Cobalt Chloride

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Cobalt Chloride
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Product Name: Cobalt Chloride
High Quality
Earliest shipment
Competitive price
Professional Service


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

IUPAC name[hide]Cobalt(II) chloride
Other names[hide]Cobaltous chloride
Cobalt dichloride
CAS number7646-79-9 Y, 
16544-92-6 (dihydrate)
7791-13-1 (hexahydrate)
ChemSpider22708 Y
EC number231-589-4
UN number3288
RTECS numberGF9800000
Jmol-3D imagesImage 1
[show]InChI=1S/2ClH.Co/h2*1H;/q;;+2/p-2 Y
Molecular formulaCoCl2
Molar mass129.839 g/mol (anhydrous)
165.87 g/mol (dihydrate)
237.93 g/mol (hexahydrate)
Appearancerose red crystals (hexahydrate)
blue crystals (anhydrous)
Density3.356 g/cm3 (anhydrous)
2.48 g/cm3 (dihydrate)
1.92 g/cm3 (hexahydrate)
Melting point

735 °C

Boiling point

1049 °C

Solubility in water436 g/L (0 °C)
450 g/L (7 °C)
529 g/L (20 °C)
Solubilitysoluble in acetone, ethanol, ether
Crystal structureCdCl2 structure
EU Index027-004-00-5
EU classificationToxic (T)
Carc. Cat. 2
Dangerous for
the environment (N)
R-phrasesR49, R60, R22, R42/43, R68, R50/53
S-phrasesS53, S45, S60, S61
NFPA 704020
Flash pointNon-flammable
LD5080 mg/kg
Other anionsCobalt(II) fluoride
Cobalt(II) bromide
Cobalt(II) iodide
Other cationsRhodium(III) chloride

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