Sodium Chromous Carbonate, Na₂CO₃.CrCO₃

Sodium Chromous Carbonate, Na₂CO₃.CrCO₃.10H₂O, separates as a reddish-brown powder when moist chromous acetate is mixed with a solution of sodium carbonate in an atmosphere of carbon dioxide. It yields microscopic, tabular, lozenge-shaped crystals. If heated at 100° C. in a current of a dry inert gas, the monohydrate, Na₂CO₃.CrCO₃.H₂O, is obtained.

A red-brown magnesium compound has also been obtained. The carbonates of the alkaline earth metals have no action on chromous acetate.