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Potassium Osmiamate, OsNO3K

Potassium Osmiamate, OsNO3K, may be obtained by the action of ammonia on a cold solution of osmium tetroxide in potassium hydroxide. Thus:

OsO4 + KOH + NH3 = OsNO3K + 2H2O.

The salt crystallises in orange-yellow, tetragonal pyramids, which partially decompose upon recrystallisation, becoming darker in colour. When heated, nitrogen gas is evolved.

The corresponding barium, silver, and sodium salts have been prepared.

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