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Ammonium Osmyl Oxybromide, (NH4)2OsO3Br2

Ammonium Osmyl Oxybromide, (NH4)2OsO3Br2, is prepared in an analogous way to the chloride. Thus:

(NH4)2OsO3(NO2)2 + 2HBr = (NH4)2OsO3Br2 + 2HNO2.

The salt is obtained as a yellow, crystalline powder, but slightly soluble in water. With potassium hydroxide ammonia is evolved, potassium osmate remaining, thus indicating the hexavalent nature of the osmium.

No corresponding potassium salt is known.

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