Gold(III) oxide
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| Names | |
|---|---|
| IUPAC name
Gold(III) oxide
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| Other names
Gold trioxide, Gold sesquioxide
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| Identifiers | |
1303-58-8  |
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| PubChem | 164805 |
| Properties | |
| Au2O3 | |
| Molar mass | 441.93 |
| Appearance | red-brown solid |
| Density | 11.34 g/cm3 at 20 °C[1] |
| Melting point | 160 °C (320 °F; 433 K) (decomposes) |
| insoluble in water, soluble in hydrochloric and nitric acid | |
| Structure | |
| Orthorombic, oF40 | |
| Fdd2, No. 43[1] | |
| Vapor pressure | {{{value}}} |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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| Infobox references | |
Gold(III) oxide (Au2O3) is the most stable oxide of gold. It is a red-brown, thermally unstable solid that decomposes at 160 °C.[2] The hydrated form is weakly acidic and dissolves in concentrated alkali to form salts that are believed to contain the Au(OH)4− ion.[2]
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.[3]
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