Chemical elements
  Tin
    Isotopes
    Energy
    Production
    Application
    Physical Properties
    Chemical Properties
      Tetramethyl Stannane
      Methyl stannic chloride
      Tin Tetra-ethyl
      Tin Tri-ethyl
      Stannous Fluoride
      Stannic Fluoride
      Sodium Stannifluoride
      Potassium Stannifluoride
      Ammonium Stannifluoride
      Stannous Chloride
      Stannic Chloride
      Chlorostannates
      Stannous Bromide
      Stannic Bromide
      Stannous Iodide
      Stannic Iodide
      Mixed Stannic Halides
      Stannous Oxide
      Stannous Hydroxide
      Stannic Oxide
      Potassium Stannate
      Stannic Acid and its Derivatives
      Parastannic Acid
      Stannyl Chloride
      Parastannyl Chloride
      Stannous Sulphide
      Stannic Sulphide
      Stannic Oxysulphide
      Stannic Iodosulphide
      Stannous Sulphate
      Stannic Sulphate
      Stannic Nitrate
      Stannous Nitrate
      Phosphor-tin
      Stannioxalic Acid
      Stannous Tartrate
      Tin and Silicon
      Stannous Tungstate
    PDB 3e94-3kwy

Parastannic Acid






It was found by Berzelius that when β-stannic acid is heated with water at 100° C. it passes into another form of stannic acid, which when air-dried has the empirical composition 5SnO2.8H2O, and is probably H2Sn5O11.7H2O. This compound when dried in a vacuum becomes 5SnO2.3H2O or H2Sn5O11.2H2O, rather than SnO2.H2O or H2Sn5O11.4H2O, which is β-stannic acid. The potassium salt of parastannic acid is K2Sn5O11.2 or 3H2O, to which parastannyl chloride, shortly to be described, corresponds.


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