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Purification of Laboratory Chemicals, 8th Edition by W.L.F. Armarego

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Hydrogen peroxide urea adduct (UHP, urea hydrogen peroxide 1:1 complex, carbamide peroxide, Debrox, Hyperol) [124-43-6] CO(NH2)2. H2O2, M 94.1, m. 85-90°(dec), 90°(dec). It is a safe alternative to H2O2 in various oxidation reactions. It is commercially available in tablets (‘rapidly soluble’, equivalent to ~ 30% H2O2) or as a white powder (with 15-17% active oxygen). It is usually used without purification after assaying for active oxygen. This is done by titration with potassium permanganate or by iodometry, i.e. titration of liberated iodine when glacial acetic acid containing Fe3 + and NaI are added. It can be recrystallised from 30% H2O2 in a molar ratio of ~ 2:3 by heating in a pyrex dish for a few minutes at ~ 60°, cooling and allowed ...

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