Tj. Chou et A. Tanioka, A VAPOR-PRESSURE MODEL FOR AQUEOUS AND NONAQUEOUS SOLUTIONS OF SINGLEAND MIXED ELECTROLYTE SYSTEMS, Fluid phase equilibria, 137(1-2), 1997, pp. 17-32
A predictive model with two parameters for the calculation of the vapo
r pressures of aqueous and non-aqueous, single and mixed electrolyte s
olutions was developed. In this development, the modified Debye-Huckel
equation was employed to account for the long-range contribution and
the concept of solvation was employed to account for the short-range c
ontribution. The proposed model has been tested with experimental data
reported in the literature of 144 aqueous single electrolyte solution
s, 24 non-aqueous single electrolyte solutions and 14 aqueous mixed el
ectrolyte solutions, of which the temperature range was 298-373 K and
the ionic strength was moderate. It was found that one parameter, lamb
da, was dependent on solvent only and could be fixed on 2.11 for water
, methanol, and ethanol solutions of all kind of electrolytes systems.
The other parameter, S, was independent of temperature. The calculate
d vapor pressures agreed well with the experimental ones, and the over
all average percentage deviation was less than 0.26%. (C) 1997 Elsevie
r Science B.V.