1973 Volume 46 Issue 10 Pages 2981-2984
Oxygen exchange between arsenate ions and crystal water in the course of hydration of anhydrous salt with water vapor and subsequent dehydration of the resulting hydrate has been studied with disodium hydrogen arsenate and with sodium dihydrogen arsenate. There is a remarkable difference in the exchange behavior between the anhydrous salt prepared by dehydration in vacuo at room temperature and that prepared at higher temperatures. In the former, the degree of exchange increases with increasing molar ratio of the reactants(arsenate to water), while in the latter, it is independent of the molar ratio. In the exchange reactions of the anhydrous salt prepared at higher temperatures, the number of exchangeable oxygen atoms of an arsenate ion is found to be 0.5 (that is, one atom for two arsenate ions) for disodium hydrogen arsenate, and 4 for sodium dihydrogen arsenate.
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