Uranous arsenide

Uranous Arsenide, UgASj, may be obtained by methods similar to those employed for the phosphide (see p. 827). When obtained bypassing h drogen over a fused mixture of sodium uranous chloride and sodium arsenide it is a greyish powder wliich readily burns in the air. It is sometimes obtained in a pj-rophoric condition. An aluminium-containing product results when the aluminothermic jiroeess, using an oxide of uranium and arsenious oxide, is employed. The purest arsenide is obtained in the crj stalline form when a mixture of hj drogen and arsenic vapour is passed over sodium uranium chloride. It is rapidly decomposed bj nitric acid. 

Uranous Antimonide, UgSb4, is not obtained by the ordinary methods used for the arsenide (see p. 332). By fusing a mixture of sodium uranous chloride, antimony, and aluminium Colani obtained a silvery white mass practically free from aluminium. The product resembled the phosphide and arsenide in properties, and produced vivid sparks when projected into the Bunsen flame. 

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