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Co(OH)₂ + 2 CHCH₂ → CoCl₂ + 2 H₂O

Co(OH)₂⁺2HCl→CoCl₂⁺₂H₂O

Co(OH)₂ + 2 HCl → CoCl₂ + 2 H₂O

Co(OH)_{2 +2}HCl→CoCl_{2 +2}H₂O

Co+ ₊₂HCl→CoCl_{2 +2}H₂O