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Chemical elements
  Thorium
    Isotopes
    Energy
    Production
    Application
    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
      Thoria
      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

Complex Thorium Sulphates

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Thorium sulphate unites with the sulphates of the alkali metals to form various complex sulphates. Berzelius appears to have obtained the salt K₄Th(SO₄)₄.2H₂O by mixing solutions of the constituent sulphates; but Rosenheim, Samter, and Davidsohn state that the anhydrous salt K₄Th(SO₄)₄ separates when the solutions are mixed; whilst the following sulphates have been obtained by Barre: Th(SO₄)₂.K₂SO₄.4H₂O; Th(SO₄)₂.2K₂SO₄.2H₂O; 2Th(SO₄)₂.7K₂SO₄. From mixed solutions of sodium and thorium sulphates the two salts Na₂Th(SO₄)₃.12H₂O and Na₂Th(SO₄)₃.4H₂O have been prepared, and from ammonium and thorium sulphates the salts

(NH₄)₂Th(SO₄)₃.4H₂O; (NH₄)₆Th(SO₄)₅.3H₂O; (NH₄)₄Th(SO₄)₄.2H₂O; (NH₄)₈Th(SO₄)₆.2H₂O.

The rubidium and caesium salts Rb₂Th(SO₄)₃.2H₂O and Cs₂Th(SO₄)₃.2H₂O have also been prepared.

The double potassium sulphates are slightly soluble in water, but insoluble in a saturated solution of potassium sulphate; the double sodium (and ammonium) salts, on the other hand, are fairly soluble in saturated sodium (and ammonium) sulphate (e.g. about 4 parts of Na₂Th(SO₄) 3.6H₂O per 100 of solution at the ordinary temperature).