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

Vapour pressure and ideality of the equimolar mixture of H2O and D2O

G Jancso and G Jakli

Australian Journal of Chemistry 33(11) 2357 - 2362
Published: 1980

Abstract

The pressure differences between H2O and the equimolar H2O-D2O mixture were measured between 5 and 90°C and the experimental data can be represented by the equation

                  In(pH2O/pmix) = 0.076624-88.161/T+25972/T2

where T is the absolute temperature. For comparison the vapour-pressure differences between pure H2O and D2O were also determined. The results show that the H2O-HDO-D2O liquid mixture does not deviate from the ideal behaviour within the limits of the experimental data. The present investigation supports the earlier conclusion that the law of the geometric mean for the vapour-pressure isotope effect in the series H2O, HDO and D2O is not obeyed.

https://doi.org/10.1071/CH9802357

© CSIRO 1980

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