|Density||11.34 g/cm3 at 20 °C|
160 °C, 433 K, 320 °F (decomposes)
|Solubility in water||insoluble in water, soluble in hydrochloric and nitric acid|
|Crystal structure||Orthorombic, oF40, SpaceGroup = Fdd2, No. 43|
| (what is: / ?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Gold(III) oxide (Au2O3) is the most stable oxide of gold. It is a red-brown, thermally unstable solid that decomposes at 160 °C. The hydrated form is weakly acidic and dissolves in concentrated alkali to form salts that are believed to contain the Au(OH)4− ion.
Anhydrous Au2O3 can be prepared by heating amorphous hydrated gold(III) oxide with perchloric acid and an alkali metal perchlorate in a sealed quartz tube at a temperature of around 250 °C and a pressure of around 30 MPa.
- Jones, P. G.; Rumpel, H.; Schwarzmann, E.; Sheldrick, G. M.; Paulus, H. (1979). "Gold(III) oxide". Acta Crystallographica Section B 35 (6): 1435. doi:10.1107/S0567740879006622.
- Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0080379419.
- Jones PG, Rumpel H, Sheldrick GM, Schwartzmann E, Gold(III) Oxide and Oxychloride, Gold Bulletin 1980, 13, 56.
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