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Nickel carbonates are hydrolyzed upon contact with aqueous acids to give solutions containing the ion [Ni(H 2 O) 6] 2+, liberating water and carbon dioxide in the process. Calcining (heating to drive off CO 2 and water) of these carbonates gives nickel(II) oxide: NiCO 3 → NiO + CO 2. The nature of the resulting oxide depends on the nature of ...