Deuterium and Oxygen-18 Tracer Study of the Dehydration and the Hydration of Copper Sulfate

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概要

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• The deuterium and oxygen-18 exchange reaction of amorphous and crystalline copper sulfate monohydrate with water in the course of the hydration of the monohydrate with heavy water vapor and the subsequent dehydration of the product has been studied.<BR>The exchange reaction of crystalline monohydrate is associated with the formation of hydrate. Amorphous monohydrate shows an increased degree of exchange over crystalline monohydrate. This increased exchangeability of amorphous monohydrate is due to the exchange reaction between surface molecules and adsorbed water. The similarity of the results of deuterium exchange reaction between oxalic acid and copper sulfate confirms the suggestion of the previous report that anhydrous oxalic acid prepared by dehydration in vacuo at low temperatures is amorphous and the degree of deuterium exchange reaction is related to the surface area of the dehydration product.<BR>The results of the oxygen-18 exchange reaction of copper sulfate monohydrate with water vapor are almost identical in essentials with those of the deuterium exchange reaction. The fifth water molecule of copper sulfate is interchangeable with the other four in the process of dehydration of pentahydrate and the hydration of monohydrate.

• 公益社団法人 日本化学会の論文

著者

• Nakagawa Keiko

  Department of Chemistry Nara Women's University

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• Deuterium and Oxygen-18 Tracer Study of the Dehydration and the Hydration of Copper Sulfate

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