Chemical elements
    Physical Properties
    Chemical Properties
      Antimony Trihydride
      Antimony Trifluoride
      Antimony Pentafluoride
      Antimony Trichloride
      Oxychlorides of Tervalent Antimony
      Antimony Tetrachloride
      Antimony Pentachloride
      Chloroantimonic Acids
      Antimonyl Perchlorate
      Antimony Tribromide
      Antimony Oxybromides
      Antimony Pentabromide
      Antimony Triiodide
      Antimony Oxyiodide or Antimonyl Iodide
      Antimony Thioiodide
      Mixed Antimony Halides
      Antimony Trioxide
      Hydrated Antimony Trioxide
      Antimony Tetroxide or Antimony Dioxide
      Antimony Pentoxide
      Antimony Trisulphide
      Antimony Pentasulphide
      Normal Antimony Sulphate
      Potassium Stibiothiosulphate
      Antimony Selenate
      Antimony tritelluride
      Antimony Phosphide
      Antimonyl Dihydrogen Phosphite
      Antimony Phosphate
      Antimony Pyrophosphate
      Antimony Thiophosphate
    PDB 1exi-2xqa

Hydrated Antimony Trioxide

Hydrated Antimony Trioxide has not been obtained by direct methods, but three substances, obtained by indirect methods, have been described as ortho-, pyro- and meta-antimonious acids, respectively, with the formulae H3SbO3, H4Sb2O5 and HSbO2. The first, which may also be regarded as antimony hydroxide, is obtained by the action of dilute sulphuric acid on a double tartrate of antimony and barium. The substance, formerly known as pyro-antimonious acid, which is obtained when antimony trisulphide is heated with a solution of potassium hydroxide, and copper sulphate then added to the mixture, was subsequently shown to be ortho-antimonic acid, H3SbO4. The substance described as meta-antimonious acid, HSbO2, is obtained by the decomposition of a double tartrate of potassium and antimony, using an alkali carbonate, phosphate or acetate.

There is, however, no conclusive evidence for the existence of these hydrated forms of antimony trioxide. No evidence for the existence of definite hydrates has been obtained from dehydration curves, and it seems probable that the various substances described are colloidal modifications of hydrated antimony trioxide differing in fineness of division.

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