Chemical elements
  Ruthenium
    Isotopes
    Energy
    Production
    Application
    Physical Properties
    Chemical Properties
      Ruthenium Fluoride
      Ruthenium Dichloride
      Ruthenium Trichloride
      Ruthenochlorides
      Potassium Chlor-ruthenate
      Potassium Aquo-chlor-ruthenate
      Caesium Aquo-chlor-ruthenate
      Ruthenium Oxychlorides
      Potassium Bromruthenite
      Potassium Bromruthenate
      Potassium Aquobromruthenate
      Ruthenium Tri-iodide
      Ruthenium Sesquioxide
      Hydrated Ruthenium Sesquioxide
      Ruthenium Dioxide
      Ruthenium Tetroxide
      Ruthenium Sesquisulphide
      Ruthenium Disulphide
      Ruthenium Trisulphide
      Ruthenium Sesquisulphite
      Ruthenium Dithionate
      Ruthenium Sulphate
      Ruthenium Nitrosotrihydroxide
      Potassium Nitrosochloivifuthenate
      Ammonium Nitrosochlor-ruthenate
      Rubidium Nitrosochlor-ruthenate
      Potassium Ruthenium Nitrite
      Sodium Ruthenium Nitrite
      Ruthenium Dicarbonyl
      Potassium Ruthenocyanide
      Barium Ruthenocyanide
      Strontium Ruthenocyanide
      Ruthenium Silicide
    PDB 1bex-4e7y

Potassium Chlor-ruthenate, K2RuCl6






Ruthenium Tetrachloride, RuCl4, probably exists in solution when the hydrated dioxide, obtained by the action of caustic alkali on the sulphate, is dissolved in hydrochloric acid. It yields a yellow solution from which the tetrachloride cannot be isolated in a pure condition, although double salts with the alkali metals have been obtained.



Potassium Chlor-ruthenate, K2RuCl6, may be prepared by adding hydrochloric acid to potassium ruthenate. The method adopted by Antony and Lucchesi consists in heating ruthenium with six times its weight of fused potassium hydroxide in a silver dish. Potassium chlorate is added little by little, and the whole stirred until all the ruthenium has dissolved. The heating is continued until evolution of gas ceases, indicating complete decomposition of the chlorate. On cooling, the orange-red-coloured melt is dissolved in cold water, and dilute hydrochloric acid added until the whole is slightly acid. Concentration is effected over quicklime until the salt crystallises out in reddish brown crystals. Potassium chlor-ruthenate may also be obtained by the action of chlorine on a concentrated, acidulated solution of potassium aquo-chlor-ruthenate, K2Ru(OH2)Cl5. It then crystallises in minute black octahedra possessed of a greenish sheen, and which are easily soluble in and rapidly decomposed by water. In hydrochloric acid a pure yellow colour is obtained if the solution is dilute, the concentrated solution being deep yellowish red.
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