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Description. Cobalt(II) chloride (CoCl 2) is the most common cobalt compound found in laboratories. The dramatic color change of blue-purple Cobalt(II) chloride to a rose color when hydrated makes CoCl 2 an excellent indicator for water in dessicants.
Co(III) derivatives. In the presence of ammonia or amines, cobalt(II) is readily oxidised by atmospheric oxygen to give a variety of cobalt(III) complexes. For example, the presence of ammonia triggers the oxidation of cobalt(II) chloride to hexamminecobalt(III) chloride: 4 CoCl 2 Â·6H 2 O + 4 NH 4 Cl + 20 NH 3 + O 2 â 4 [Co(NH 3) 6]Cl 3 + 26 H 2 O The reaction is often performed in the presence of charcoal as a catalyst, or hydrogen peroxide is employed in place of air.