Title: Gold Trioxide

CAS Registry Number: 1303-58-8

Additional Names: Auric oxide; gold sesquioxide; gold oxide

Molecular Formula: Au2O3

Molecular Weight: 441.93

Percent Composition: Au 89.14%, O 10.86%

Literature References: Prepd from the hydroxide: Roseveare, Buehner, J. Am. Chem. Soc. 49, 1221 (1927).

Properties: Brown powder; begins to evolve oxygen at 110°; at 250° it is entirely dec to metallic gold; also slowly dec by sunlight. Practically insol in water. Sol in HCl, concd HNO3 and in NaCN soln. Keep protected from light.