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Gold(III) oxide

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Title: Gold(III) oxide  
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Subject: Gold(III) hydroxide, Gold chalcogenides, Sesquioxides, Oxide, Gold monoiodide
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Gold(III) oxide

Gold(III) oxide
CAS number  YesY
Molecular formula 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)
Solubility in water insoluble in water, soluble in hydrochloric and nitric acid
Crystal structure Orthorombic, oF40, SpaceGroup = Fdd2, No. 43[1]
NFPA 704
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 YesY   YesY/N?)

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]


  1. ^ a b Jones, P. G.; Rumpel, H.; Schwarzmann, E.; Sheldrick, G. M.; Paulus, H. (1979). "Gold(III) oxide". Acta Crystallographica Section B 35 (6): 1435.  
  2. ^ a b  
  3. ^ Jones PG, Rumpel H, Sheldrick GM, Schwartzmann E, Gold(III) Oxide and Oxychloride, Gold Bulletin 1980, 13, 56.

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