Nomenclature
CAS number: 1303-58-8
Auric oxide; gold sesquioxide; gold oxide.
Au
2O
3; mol wt 441.93.
Au 89.14%, O 10.86%.
Description and 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.