Chemical elements
    Physical Properties
    Chemical Properties
      Thorium Hydride
      Thorium Fluoride
      Thorium Oxyfluoride
      Potassium Thorifluoride
      Thorium Chloride
      Thorium Oxychloride
      Complex Thorium Chlorides
      Thorium Bromide
      Thorium Oxybromide
      Thorium Iodide
      Thorium Dioxide
      Metathorium Oxide
      Thorium Hydroxide
      Thorium Superoxide
      Thorium Sulphide
      Thorium Sulphite
      Thorium Sulphate
      Complex Thorium Sulphates
      Thorium Selenite
      Thorium Selenate
      Thorium Nitride
      Thorium Nitrate
      Thorium Orthophosphate
      Thorium Arsenates
      Thorium Carbide
      Thorium Carbonate
      Thorium Formate
      Thorium Acetate
      Thorium Oxalate
      Thorium Tartrate
      Thorium Acetylacetone
      Thorium Silicide
      Thorium Silicate
      Thorium Borides

Thorium Orthophosphate, Th3(PO4)4

Thorium Orthophosphate is practically insoluble in water and only sparingly soluble in dilute acids; its formation therefore serves partially to separate thorium from other metals occurring in monazite sand, whose phosphates are more soluble in dilute sulphuric acid.

According to Cleve the normal phosphate, Th3(PO4)4.4H2O, is precipitated when disodium hydrogen phosphate is added to thorium nitrate solution; but Volck has shown that the precipitate contains sodium. Various complex phosphates of thorium and the alkali metals have been described, also the chlorophosphate ThCl4.3ThO2.2P2O5 and the bromophosphate ThBr4.(3ThO2.2P2O5)3.

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