Journal
JOURNAL OF SOLUTION CHEMISTRY
Volume 31, Issue 10, Pages 793-799Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1023/A:1021341226708
Keywords
hygrometric method; magnesium and potassium sulfate solutions; relative humidity; water activity; osmotic coefficient; activity coefficient; excess Gibbs energy
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Ternary aqueous solutions of MgSO4 and K2SO4 have been studied by the hygrometric method at 25degreesC. The relative humidity of this system is measured at total molalities from 0.35 mol-kg(-1) to about saturation for three ionic-strength fractions (y = 0.25, 0.50, and 0.80 of MgSO4. The data allow calculation of water activities and osmotic coefficients. From these measurements, the Pitzer ionic mixing parameters are determined and used to predict the solute activity coefficients in the mixture. The results are used to calculate the excess Gibbs energy at total molalities for ionic-strength fraction y.
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