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Hydrofluogermanic Acid, H2GeF6

Hydrofluogermanic Acid, H2GeF6, is formed in solution in an analogous way to H2SiF6, i.e. by passing the vapour of the tetrafluoride into water:

3GeF4 + 2H2O = 2H2GeF6 + GeO2.

The reaction differs, however, from the analogous reaction of silicon tetrafluoride, because the hydrated germanic oxide formed remains in solution. The addition of potash to the solution produces potassium germanifluoride, whilst excess of ammonia precipitates the oxide.

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