Cobalt Chloride (CoCl2)-Beads

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

 

Cobalt(II) chloride is used in humidity indicator in weather instruments. In the anhydrous form, it finds use in electroplating of cobalt, in organic chemistry and is a precursor to cobaltocene, (bis(cyclopentadienyl)cobalt(II), which is a good reducing agent. It also serves as a Lewis acid. Cobalt chloride is an indicator for water in desiccants, owing to the reversible hydration/dehydration coupled with distinct color change. Cobalt chloride is useful for producing invisible ink as it turns blue when heated and becomes invisible once it gets cooled. Cobalt(II) chloride catalyzes cross coupling of aryl halides or vinyl halides with aryl grignard reagents in excellent yields.