Abstract
When CaH 2 reacts with D 2O solutions, slightly more than two-thirds of the evolved hydrogen is HD, and hydrolysis is the only reaction occurring when such oxidizing agents as Ag +, Ce 4+, Cr 2O 7 = and MnO 4 − are present. In the reaction of MgH 2 with D 2O and DCl solutions, HD is again the major product and the proportion of HD increases significantly with increasing acidity. Aqueous Ag + is reduced by MgH 2 with most of the hydride hydrogen being released as hydrogen gas without exchange with the solvent. Cerium hydrides in the composition range CeH 2.18-CeH 2.96 react with solutions of non-oxidizing acids to evolve hydrogen gas, the major isotopic species of which contains one atom from the hydride and one atom from the solvent. When the cerium hydrides undergo hydrolysis in solutions of low acidity, most of the hydride hydrogen is lost to the solvent by exchange. Oxidation of cerium hydrides by Ag +, NO 3 − and H 2O 2 is more rapid than hydrolysis, and most of the evolved hydrogen is derived from the hydride.
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