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Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
RESEARCH ARTICLE

Transpiration vapour pressures and activities in the molten salt systems ZnCl2 + NaCl and ZnCl2 + KCl

H Bloom, TH Spurling and J Wong

Australian Journal of Chemistry 23(3) 501 - 509
Published: 1970

Abstract

Vapour pressure measurements were made by a transpiration method for molten zinc chloride and molten mixtures of this salt with sodium and potassium chlorides, respectively. Activities of zinc chloride in the mixtures were calculated and from these values, those of the alkali chloride were calculated by Gibbs-Duhem integration. For this purpose a convenient computer method has been devised. Although the large deviations of activity and activity coefficients qualitatively support independent evidence that complex ions are formed in these systems, the results cannot quantitatively be explained using a calculation due to Braunstein in terms of interactions in the melt to form complex ions of a unique type, e.g. ZnCl3- or ZnCl42- etc. This indicates that the departure from ideal behaviour needs to be explained by a more detailed theory.

https://doi.org/10.1071/CH9700501

© CSIRO 1970

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