Cuprous oxide
Copper oxide is a copper oxide, the formula for the Cu2O, red to reddish brown crystal or powder. It is insoluble in water and organic solvents, but soluble in dilute hydrochloric acid, dilute sulfuric acid, ammonium chloride solution. Dissolved in concentrated ammonia solution to form colorless complex Cu2 +. It is oxidized to blue in the air 2+. Copper oxide is decomposed into copper and oxygen at 1800 ° C, which is stable in dry air but slowly oxidized to copper oxide in humid air. Copper oxide is soluble in hydrochloric acid to form HCuCl2 (cupric chloride complex), also soluble in sulfuric acid and nitric acid, respectively, the formation of copper sulfate and copper nitrate. ...