Chemical elements
  Scandium
    Ekaboron
    Isotopes
    Energy
    Production
    Physical Properties
    Chemical Properties
      Scandium fluoride
      Scandium chloride
      Scandium bromide
      Scandium perchlorate
      Scandium iodate
      Scandia
      Scandium sesquioxide
      Scandium hydroxide
      Scandium sulphide
      Scandium sulphite
      Scandium basic thiosulphate
      Scandium sulphate
      Scandium potassium sulphate
      Scandium ammonium sulphate
      Scandium sodium sulphate
      Scandium selenite
      Scandium selenate
      Scandium nitrate
      Scandium carbonate
      Scandium oxalate
      Scandium acetylacetonate
      Scandium orthoborate

Scandium fluoride, ScF3






Scandium fluoride, ScF3, is obtained as a white powder, difficult to filter, by heating scandia with aqueous hydrofluoric acid, or by precipitating a solution of a scandium salt with hydrofluoric acid, an alkali fluoride, or fluosilicic acid. The fluoride is fusible with difficulty in the blow-pipe flame. It is very slightly soluble in hydrochloric acid, in which it resembles the thorium salt and differs from the salts of the rare earth metals (Crookes; Meyer and Wassjuchnow).

Scandium fluoride, like zirconium fluoride, is soluble in solutions of the alkali fluorides. Scandium ammonium fluoride, ScF3.3NH4F, is readily soluble in water, from which it crystallises in octahedra. It is decomposed by hydrochloric or dilute sulphuric acid with the precipitation of scandium fluoride or scandium ammonium sulphate. In aqueous solution it may be regarded as yielding chiefly the ions 3NH4' and ScF6''', since it does not give any precipitate when boiled with ammonia. Sodium or potassium hydroxides, however, precipitate scandium hydroxide. The corresponding potassium and sodium salts, ScF3.3KF and ScF3.3NaF, are known; they are less soluble in water and less "complex" than the ammonium salt (Meyer and Wassjuchnow).


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