Chemical elements
  Germanium
    Isotopes
    Energy
    Production
    Application
    Physical Properties
    Chemical Properties
      Germanium Hydride
      Germanium Tetra-ethyl
      Germanium Chloroform
      Germanous Fluoride
      Germanic Fluoride
      Hydrofluogermanic Acid
      Potassium Germanifluoride
      Fluogermanate
      Germanous Chloride
      Germanic Chloride
      Germanium Oxychloride
      Germanic Bromide
      Germanic Iodide
      Germanous Oxide
      Germanous Hydroxide
      Germanic Oxide
      Germanous Sulphide
      Germanic Sulphide
      Germanium Ultramarine

Germanous Sulphide, GeS






Germanous Sulphide, GeS, the best characterised germanous compound, may be prepared in the dry or wet way. In the dry way it is produced by heating a mixture of the disulphide and metallic germanium in a current of carbon dioxide, or by igniting the disulphide in a stream of hydrogen. In the latter case reduction may proceed as far as the metal. In the wet way the sulphide is obtained by precipitating a germanous solution with hydrogen sulphide. Precipitated, amorphous germanous sulphide is brownish red, but when this compound is prepared in the dry way it is obtained in thin greyish black, metallic-looking plates, which are rhombic or monoclinic and appear red by transmitted light; it melts to a dark-coloured liquid and can be vaporised without decomposition, the vapour density at 1100° C. being 3.54 (air = 1) or 51.0 (H = 1), theory for GeS requiring 3.60 (air = 1) or 51.8 (H = 1). This sulphide is slightly soluble in water, and dissolves in concentrated hydrochloric acid, forming a solution from which it is reprecipitated by hydrogen sulphide, thus:

GeS + 2HClGeCl2 + H2S.

It also dissolves in alkalis and is precipitated again by acid; with yellow ammonium sulphide it forms a thio-salt of GeS2. Thus GeS resembles SnS in chemical properties, though it is probably more acidic than the latter sulphide. When the precipitated sulphide is washed it shows a tendency to pass into the colloidal state.


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