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Hydrogen peroxide forms addition compounds with many organic substances, and with some salts: (NH4)2SO4,H2O2; K2CO3,2H2O2; Na2HPO4,H2O2. In these compounds it shows analogies with water of crystallisation. The crystalline compound with urea, CON2H4,H2O2, stabilised by a trace of citric acid, is known commercially as hyperol: it liberates hydrogen peroxide when dissolved in water. The crystalline com pound, (NH4)2SO4,H2O2, obtained from 30 per cent, hydrogen peroxide and ammonium sulphate, gives very concentrated hydrogen peroxide when distilled in a vacuum.
Hydrogen peroxide is a feeble acid, much weaker than carbonic acid. With ammonia it forms directly the salt-like compounds, NH4-O2H (ammonium hydrogen peroxide), and (NH4)2O2 (ammonium peroxide). The compounds NaO2H and Na2O2 are known.
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