Chemical elements
  Germanium
    Isotopes
    Energy
    Production
    Application
    Physical Properties
    Chemical Properties
      Germanium Hydride
      Germanium Tetra-ethyl
      Germanium Chloroform
      Germanous Fluoride
      Germanic Fluoride
      Hydrofluogermanic Acid
      Potassium Germanifluoride
      Fluogermanate
      Germanous Chloride
      Germanic Chloride
      Germanium Oxychloride
      Germanic Bromide
      Germanic Iodide
      Germanous Oxide
      Germanous Hydroxide
      Germanic Oxide
      Germanous Sulphide
      Germanic Sulphide
      Germanium Ultramarine

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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