4CoCl2 + 4NH4Cl + 16(NH3•H2O) + O2 → 4[Co(NH3)5Cl]Cl2 + 18H2O
Cobalt(II) chloride react with ammonium chloride, ammonium hydroxide and oxygen to produce chloridopentaamminecobalt(III) chloride and water. Ammonium hydroxide - diluted solution. This reaction takes place at a temperature of 0°C.