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Osmium Sesquioxide, Os2O3

Osmium Sesquioxide, Os2O3, is obtained by heating salts of trivalent osmium with sodium carbonate in a current of carbon dioxide. It also results when an excess of osmium tetroxide is reduced by heating with finely divided osmium.

The sesquioxide is a dark powder, insoluble in acids. It is obtained in the hydrated condition, Os2O3.xH2O, as a reddish brown precipitate on adding an alkali to an aqueous solution of an osmochloride.

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