Synthesis
All syntheses start from the perxenates, which are accessible from the xenates through two methods. One is the disproportionation of xenates to perxenates and xenon:
- 2 HXeO4– + 2 OH– → XeO64– + Xe + O2 + 2 H2O
The other is oxidation of the xenates with ozone in basic solution:
- HXeO4– + O3 + 3 OH– → XeO64– + O2 + 2 H2O
Barium perxenate is reacted with sulfuric acid and the unstable perxenic acid is dehydrated to give xenon tetroxide:
- Ba2XeO6 + 2 H2SO4 → 2 BaSO4 + H4XeO6
- H4XeO6 → 2 H2O + XeO4
Any excess perxenic acid slowly undergoes a disproportionation reaction to xenic acid and oxygen:
- 2 H4XeO6 → O2 + 2 H2XeO4 + 2 H2O
Read more about this topic: Xenon Tetroxide
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