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

Boric Acids

Numerous boric acids are theoretically capable of being produced by the union of boron sesqui-oxide and water in different proportions, and the existence of various boric acids seems necessary in order to account for the types of borates known. At the present time, however, the existence in the solid state of only two boric acids, orthoboric acid, H3BO3 (i.e. B2O3.3H2O), and metaboric acid, HBO2 (i.e. B2O3.H2O), can be definitely affirmed. The latter is formed by heating the former to 100°-140°, and in aqueous solution it passes into the former, as is shown by molecular weight determinations. The existence of pyroboric acid, H2B4O7, has been assumed by various chemists, but cannot be regarded as proved.

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