Barium, Peroxide of

BaO 2 . Syn. Deutox′ide of barium ; Ba′′rii binox′ydum , . L.; Binoxide de baryum , ., Fr. Prep. Pure baryta is heated to full redne in a porcelain tube, and a stream of pure dry oxygen pa ed over it as long as the gas is absorbed. Baryta, 4 parts, is heated as above in a platinum crucible, and chlorate of pota ium, 1 part, gradually added to it; the chloride of pota ium formed along with the binoxide being afterwards washed away with cold water. Prop., . Grey or greyish-white; with water it forms a hydrate, which is slightly soluble in water, and undecomposed by it in the cold. It is interesting chiefly in its relations with peroxide of hydrogen and the oxygenised acids of M. Thénard.