Cobalt(II) carbonate hydroxide

Red violet crystal; insoluble in water; decomposes in hot water; soluble in dilute acids and ammonia.

The cobalt carbonate basic salt is the commercially-used cobalt carbonate. It is used primarily for manufacturing cobalt pigments. It also is used to prepare cobalt(II) oxide and other cobalt salts.

The basic carbonate is prepared by adding a solution of sodium carbonate to a cobalt(II) acetate or other Co2+ salt solution. The precipitate is filtered and dried.