Chemical elements
    Physical Properties
    Chemical Properties
      Scandium fluoride
      Scandium chloride
      Scandium bromide
      Scandium perchlorate
      Scandium iodate
      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

Chemical Properties of Scandium

Compounds of Scandium

Scandium salts derived from colourless acids are themselves colourless and devoid of absorption spectra. They are diamagnetic, and have a sweet, astringent taste. In aqueous solution they are perceptibly hydrolysed. This will be seen from the following values for the equivalent conductivities of scandium chloride and other chlorides, the abnormal increase in the conductivity of scandium chloride with dilution from v = 32 to i; = 1024 litres being due to the high ionic mobility of the hydrogen ions of the acid set free by hydrolysis: -

Temperature, 25° C.
v = 32641282565121024λ1024 - λ32

The basic oxide scandia, Sc2O3, from which the scandium salts are derived, is decidedly stronger than alumina. It is, however, weaker than any of the rare earths of the type R22O3.

Scandium is often included among the rare earth elements. In doing so, however, it becomes difficult to decide whether scandia is to be regarded as an earth of the cerium or of the yttrium group. So far as basicity of oxide and solubilities of salts are concerned, scandium resembles the yttrium group; on the other hand, the solubility of its double potassium sulphate places it with the cerium group. It differs from both groups in not forming a sulphate, Sc2(SO4)3.8H2O, and a nitrate, Sc(NO3)3.6H2O. Further, scandium has a marked tendency to form what are probably complex as distinguished from double salts, and in this and in other respects it shows a remarkable resemblance to thorium. In view of the fact that the cerium and yttrium groups of rare earth elements are distinguished by their platinocyanides, it is of interest to note that scandium platinocyanide, Sc2[Pt(CN)4]3, forms hydrates both with 18H2O and with 21H2O.

A few salts of scandium were described by Nilson and Cleve; many others have since been prepared and described by Crookes, and by R. J. Meyer and his co-workers.

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