Chromous Carbonate, CrCO₃

Chromous Carbonate, CrCO₃, is obtained as a grey amorphous precipitate by the action of an alkali carbonate on a solution of a chromous salt. It is soluble in water charged with carbon dioxide. When heated, carbon dioxide is evolved, leaving a residue of chromium sesquioxide.

A series of double carbonates has been prepared by acting on chromous acetate, or tartrate, with alkali carbonates.