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

Potassium Stannate, K2SnO3






Potassium Stannate, K2SnO3.3H2O, is prepared similarly to the sodium salt. It cannot, however, be completely dehydrated by heating, but decomposes, forming potassium hydroxide and stannic acid. Consequently the water present is water of hydroxylation rather than of hydration, and this and other salts are derived from hexahydroxy-stannic acid, H2Sn(OH)6, which is analogous to hexahydroxyplatinic acid, H2Pt(OH)6. This conclusion is confirmed by the fact that insoluble stannates obtained by double decomposition contain the same proportion of water. Thus precipitated lead stannate is PbSnO3.3H2O, and may be formulated PbSn(OH)6. This constitution relates hexahydroxystannates to the stanni-chlorides M'2SnCl6, which are analogous to the platini-chlorides M'2PtCl6. No orthostannates have hitherto been recognised, but Hedvall has prepared cobaltous orthostannate, Co2SnO4, by fusing cobaltous and stannic oxides with potassium chloride at 1100° C. or 1300°-1400° C., and dissolving out the excess of stannic oxide by warm, dilute hydrochloric acid. The product is dark green, and has a density of 6.30 at 18° C.
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