Chemical elements
    Physical properties
    Chemical properties
      Boron Hydrides
      Boron trihydride
      Boron halogen
      Boron trifluoride
      Hydrofluoboric acid
      Potassium borofluoride
      Fluoboric acid
      Perfluoboric acid
      Boron subchloride
      Boron trichloride
      Boron tribromide
      Boron tri-iodide
      Oxides of Boron
      Tetraboron trioxide
      Boron dioxide
      Tetraboron pentoxide
      Boron sesqui-oxide
      Boron trioxide
      Boric anhydride
      Boric Acids
      Orthoboric acid
      Boric acid
      Boracic acid
      Complex Boric Acids
      Perboric Acid and Perborates
      Sodium perborate
      Sodium hyperborate
      Potassium perborate
      Rubidium perborate
      Ammonium perborate
      Barium perborate
      Boron sesquisulphide
      Boron trisulphide
      Boron pentasulphide
      Boron selenide
      Boron nitride
      Boron amide
      Boron imide
      Boron phosphide
      Boron phospho-iodides
      Boron carbide
      Boron thiocyanate
      Boron Alkyls
      Boron trimethyl
      Boron Silicides and

Perfluoboric acid

This acid is not known, but several perfluoborates have been prepared.

Potassium fluohyperborate

Potassium fluohyperborate, K4B4F4O11.H2O, is prepared by dissolving the compound B2O3.2KF in cold water, adding a slightly alkaline solution of hydrogen peroxide, then adding alcohol and stirring. The dry salt is a white, crystalline solid. The aqueous solution is alkaline and slowly evolves oxygen; dilute sulphuric acid added to the solution liberates hydrogen peroxide. Concentrated sulphuric acid decomposes the substance, ozonised oxygen being evolved.

The potassium salt

The potassium salt, K2B2F2O6.H2O or O2(BF.O.OK)2.H2O, and the ammonium salt, (NH4)2B2F2O6.3H2O, have also been obtained.
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