Cobalt Chloride (CoCl2)-Powder

Characteristic

Cobalt(II) chloride is an inorganic compound of cobalt and chlorine, with the formula CoCl₂. It is a sky blue crystalline solid.

Chemical formula：CoCl₂

Molar mass：129.839 g/mol (anhydrous)

                      165.87 g/mol (dihydrate)

                      237.93 g/mol (hexahydrate)

Appearance：blue crystals (anhydrous)

                       violet-blue (dihydrate)

                       rose red crystals (hexahydrate)

Density：3.356 g/cm3 (anhydrous)

                2.477 g/cm3 (dihydrate)

                1.924 g/cm3 (hexahydrate)

Melting point：726 °C (1,339 °F; 999 K) ±2 (anhydrous)

                          140 °C (monohydrate)

                          100 °C (dihydrate)

                          86 °C (hexahydrate)

Boiling point：1,049 °C (1,920 °F; 1,322 K)

Solubility in water：43.6 g/100 mL (0 °C)

                                 45 g/100 mL (7 °C)

                                 52.9 g/100 mL (20 °C)

                                 105 g/100 mL (96 °C)

Solubility：38.5 g/100 mL (methanol)

                   8.6 g/100 mL (acetone)

                   soluble in ethanol, pyridine, glycerol

Magnetic susceptibility (χ)：+12,660·10⁻⁶ cm³/mol

Application

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 of cobalt chloride include its role in organic synthesis and electroplating objects with cobalt metal.