Chemical elements
  Gold
    Isotopes
    Energy
    Production
    Extraction
    Application
    Physical Properties
    Chemical Properties
      Aurous fluoride
      Aurous chloride
      Aurous bromide
      Aurous iodide
      Aurous oxide
      Aurous sulphide
      Aurous thiosulphate
      Aurous Derivatives of Nitrogen
      Aurous cyanide
      Potassium aurothiocyanate
      Ammonia and Aurous Halides
      Gold dichloride
      Gold dibromide
      Gold monoxide
      Gold monosulphide
      Gold monosulphate
      Nitride of Bivalent Gold
      Auric chloride
      Aurichloric Acid
      Auric bromide
      Auribromic Acid
      Auric iodide
      Auri-iodic Acid
      Auric iodate
      Auric hydroxide
      Auric sulphide
      Auric sulphate
      Acid auryl sulphate
      Auric selenide
      Auric selenate
      Auric telluride
      Gold and Nitrogen
      Auric nitrates
      Gold and Phosphorus
      Gold arsenides
      Auric selenide
      Auric antimonide
      Auric cyanide
      Salts of Auricyanic Acid
      Double Salts of Auric thiocyanate
      Gold carbide
      Gold and Silicon
    PDB 1a52-4acl

Auric sulphide, Au2S3






Gold does not combine directly with sulphur, but at -2° C. a rapid current of hydrogen sulphide transforms aurichloric acid, HAuCl4, in dilute solution in normal hydrochloric acid, into pure auric sulphide. Lithium aurichloride, LiAuCl4,2H2O, at -10° C. is converted by hydrogen sulphide into a mixture of lithium chloride and impure auric sulphide, with evolution of hydrogen chloride. After extraction of the lithium chloride with alcohol, the sulphide is dried in a current of nitrogen at 70° C. It is an amorphous, black powder, at once decomposed by the action of water. At 200° to 205° C. it is converted into a mixture of gold and sulphur. It forms double sulphides with the alkali-metals; and also unites with the sulphides of elements of weak positive, or even of negative,- character, such as arsenic, tellurium, molybdenum, and carbon. The last class of compound is probably to be regarded as an auric salt of a complex acid containing sulphur and one of the elements mentioned.


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