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Uranium Pentoxide, U2O5

The existence of Uranium Pentoxide, U2O5, is not definitely established. It has been described as the black product obtained when a uranium salt of a volatile acid is strongly ignited in air; 7 when uranyl sulphate, (UO2)SO4.3H2O, is rapidly heated; when ammonium diuranate, (NH4)2U2O7.6H2O, is heated in a carbon crucible; and when a solution of uranyl nitrate is electrolysed. Many observers regard the substance as a mixture of uranous oxide and urano-uranic oxide, but from a study of the dissociation tension of the latter oxide Schwarz gained evidence of the existence of an intermediate oxide, and by heating the higher oxide in a stream of carbon dioxide in an electric furnace at 1122° C. he obtained a black product of the approximate composition U2O5. The substance is reduced to uranous oxide by strongly heating in hydrogen. It dissolves in acids to form uranous and uranyl salts.

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