Chromous Bromide, CrBr₂

Chromous Bromide, CrBr₂, is obtained by passing hydrogen bromide, or nitrogen saturated with bromine vapour, over strongly heated chromium, or by heating chromic bromide in hydrogen. It is a white crystalline solid, which becomes yellowish on fusion and yields a green basic chromic bromide on exposure to air. It is soluble in water, forming a blue solution which can dissolve large quantities of violet chromic chloride, and which rapidly absorbs oxygen from the air. The solution may be prepared by heating a dilute solution of chromic acid with hydrobromic acid and reducing with zinc.