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Lanthanum peroxide

An oxide of lanthanum higher than La2O3 cannot be prepared in the dry way, but indications of the existence of such an oxide have been obtained.

When a mixture of ammonia and hydrogen peroxide is added to a solution of a lanthanum salt, a gelatinous, hydrated peroxide, La9O5.xH2O, is obtained, to which the constitution (OH)2La(O.OH) has been ascribed. Dilute sulphuric acid and carbonic acid set free hydrogen peroxide from the precipitate, and concentrated sulphuric acid decomposes it with the liberation of ozonised oxygen.

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