A study of dehydration and hydration of sodium dihydrogen phosphate and racemic acid by means of the deuterium exchange reaction

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<jats:title>Abstract</jats:title> <jats:p>In order to examine the generality of the results obtained with oxalic acid, the following questions were studied with sodium dihydrogen phosphate and in part with racemic acid: (1) the relation between the deuterium exchange reaction and the surface area of the anhydrate, and the amorphous character of the anhydrate prepared by dehydration in vacuo at low temperatures, (2) recrystallization of the amorphous anhydrate under the catalytic action of adsorbed water, and (3) deuterium exchange reaction in anhydrate-hydrate mixture.</jats:p> <jats:p>The results obtained with sodium dihydrogen phosphate and racemic acid are similar to those obtained with oxalic acid. It appears that formation of amorphous anhydrate in the dehydration of crystal hydrate in vacuo at low temperatures and its recrystallization under the catalytic action of adsorbed water are phenomena of general occurrence.</jats:p> <jats:p>The deuterium exchange reaction of crystalline anhydrate may be used to determine the composition of the hydrate formed on hydrating an anhydrate under a given condition.</jats:p>

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