Chemical elements
  Iridium
    Isotopes
    Energy
    Production
    Application
    Physical Properties
    Chemical Properties
      Iridium Monochloride
      Iridium Dichloride
      Iridium Trichloride
      Potassium Chloriridite
      Sodium Chloriridite
      Ammonium Chloriridite
      Aquo Chloriridites
      Iridium Tetrachloride
      Potassium Chloriridate
      Sodium Chloriridate
      Ammonium Chloriridate
      Silver Chloriridate
      Thallium Chloriridate
      Iridium Tribromide
      Iridium Tetrabromide
      Potassium Bromiridate
      Sodium Bromiridate
      Ammonium Bromiridate
      Iridium Oxybromide
      Iridium Tri-iodide
      Potassium Iodiridite
      Iridium Tetra-iodide
      Potassium Iodiridate
      Iridium Monoxide
      Iridium Sesquioxide
      Iridium Dioxide
      Iridium Trioxide
      Iridium Monosulphide
      Iridium Sesquisulphide
      Iridium Disulphide
      Iridium Sesquisulphite
      Potassium Iridium Sulphite
      Iridium Sesquisulphate
      Potassium Iridium Alum
      Ammonium Iridium Alum
      Caesium Iridium Alum
      Rubidium Iridium Alum
      Iridium Disulphate
      Iridium Sesquiselenide
      Hydrogen Iridi-nitrite
      Potassium Iridi-nitrite
      Sodium Iridi-nitrite
      Ammonium Iridi-nitrite
      Hydrogen Iridicyanide
      Potassium Iridicyanide
      Barium Iridicyanide
    PDB 1c1k-4enb

Potassium Chloriridite, K3IrCl6






Potassium Chloriridite, K3IrCl6.3H2O, results (1) when potassium carbonate and chloriridate are heated to redness; (2) on heating potassium chloriridate in hydrogen chloride at 440° C. Some insoluble iridium trichloride is simultaneously produced; (3) it is also formed by reducing a suspension of chloriridate in water with sulphur dioxide, hydrogen sulphide, or nitric oxide. The salt crystallises in olive prisms, which effloresce in the air, and are readily soluble in water, although insoluble in alcohol.

The monohydrate, K3IrCl6.H2O, was prepared by Duffour by the action of hydrochloric acid upon the double oxalates of iridium and potassium at boiling temperature. It yields greenish brown orthorhombic crystals, isomorphous with its rhodium analogue, K3RhCl6.H2O.

The aqueous solution on prolonged boiling deposits an oxychloride in the form of a green powder. Chlorine water or aqua regia converts the salt into the chloriridate. Addition of excess of alkali to a solution of the chloriridite in water does not cause a precipitate to form, since the sesquioxide dissolves as rapidly as formed (vide infra), yielding an olive-green solution.


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