Perxenate solutions hydrolysis

Xenon hexafluoride hydrolyzes in excess dilute acid or water to produce XeOa [Xe(VI)] in solution. Hydrolysis with strong base results in the precipitation of a perxenate salt [Xe(VIlI)]. Xenon hexafluoride is a fairly strong fluorinating agent, and it forms addition compounds w ith other fluorides such as BF3, AsFs, SbFs, and alkali metal fluorides. 

Hydrolysis of xenon hexafluoride or tetrafluoride with a sodium hydroxide solution results in the precipitation of a stable xenon (VIII) salt, sodium perxenate, Na4XeOe, which on heating does not decompose until around 300°. Similar hydrolysis with potassium hydroxide can yield a yellow precipitate which is a mixed potassium perxenate-xenon trioxide salt, and is explosive even when damp. With more concentrated base, the much more stable hydrated perxenate may be isolated. 

Sodium perxenate is stable at room temperature, but if left exposed to the air, it may absorb water and carbon dioxide. The salt is soluble in water to the extent of about 0.025 M, and the solutions are basic because of hydrolysis ... 

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