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Sodium Osmium Hexachloride, Na6OsCl12

Sodium Osmium Hexachloride, Na6OsCl12 or OsCl6.6NaCl, has been prepared by Rosenheim and Sasserath by passing dry hydrogen chloride over sodium osmisulphite, gently warming the while. A black reaction product is obtained, which is dissolved in a small quantity of water and recrystallised over sulphuric acid. Bright, coppery leaflets are obtained consisting of sodium osmium hexachloride, contaminated with a small quantity of sulphite. Addition of potassium chloride to the solution of the salt does not yield the corresponding potassium salt, but potassium chlorosmate; neither could the potassium or ammonium salt be obtained by the direct method.

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