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

Palladous Iodide, PdI2






Palladium is stained by iodine solution and tarnished by iodine vapour, whilst a certain amount of combination between the two elements takes place when they are heated together, if the metal is in a finely divided condition. Palladium is slowly attacked by a mixture of nitric and hydriodic acid. In each of these cases a little palladous iodide is produced.

A convenient method of preparing the salt consists in adding potassium iodide to a slight excess of palladous chloride solution, when it is precipitated as a black mass, readily soluble in excess of potassium iodide. When dried in air it contains one molecule of water; heated to 300-360° C. it decomposes, evolving iodine. In order to remove the last traces of iodine, however, it is necessary to heat to redness in a current of hydrogen.

Ammonia converts palladous iodide into the diammoniate, PdI2.2NH3. Although insoluble in water, alcohol, and ether, it dissolves slightly in hydriodic acid, and easily in aqueous potassium iodide, yielding:

Potassium Iodopalladite, K2PdI4, which, upon concentration, crystallises out as black, hygroscopic cubes.


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