Chemical elements
  Palladium
    Isotopes
    Energy
    Production
    Application
    Physical Properties
    Chemical Properties
      Palladous Fluoride
      Palladous Chloride
      Dichlor-palladous Acid
      Tetrachlor-palladites
      Palladium Trichloride
      Pentachlor-palladates
      Hexachlor-palladates
      Palladous Bromide
      Brom-palladites
      Brom-palladates
      Palladous Iodide
      Palladous Oxide
      Hydrated Palladium Sesquioxide
      Hydrated Palladium Dioxide
      Palladium Subsulphide
      Palladium Monosulphide
      Potassium Thio-palladite
      Palladium Disulphide
      Sodium Thio-palladate
      Palladous Sulphate
      Palladous Selenide
      Palladous Selenate
      Palladous Nitrate
      Palladium Cyanide
      Potassium Palladocyanide
      Palladium Monosilicide
    Catalytic Activity
    Types
    PDB 1ks4-3np2

Palladium Monosulphide, PdS






Palladous Sulphide, Palladium Monosulphide, PdS, results on heating together sulphur and ammonium chlor-palladate; it is also formed by passing pure hydrogen sulphide over palladosammine chloride at 70° to 80° C. The mass becomes black, and at higher temperatures ammonium chloride volatilises, leaving a residue, insoluble in individual mineral acids, but soluble in mixtures such as aqua regia.

As obtained in either of the foregoing ways, palladous sulphide is a hard, metallic-looking substance, melting at approximately 950° C., and insoluble in all ordinary solvents.

On passing hydrogen sulphide through a solution of a palladous salt, a dark brown precipitate is obtained, which is presumably another form of palladous sulphide.5 It is insoluble in ammonium sulphide and in hydrochloric acid, but it dissolves both in nitric acid and in aqua regia. When heated in air, a basic sulphate is produced, whilst in chlorine palladous chloride is formed. Potassium cyanide gradually effects its solution. With sulphides of the alkali metals, sulpho- or thio-palladites, M2Pd3S4, are formed.


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