Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9626007 | Fluid Phase Equilibria | 2005 | 7 Pages |
Abstract
In this investigation, the mixed aqueous electrolyte system of nitrate and sulfate with common ammonium cation has been studied with the hygrometric method at the temperature 298.15 K. The water activities of the system [yNH4NO3 + (1 â y)(NH4)2SO4](aq) are measured at total molalities from 0.4 mol kgâ1 up to saturation for different ionic-strength fractions y of NH4NO3 with y = 0.2, 0.5 and 0.8. The obtained data allow the deduction of osmotic coefficients. The experimental results are compared with the predictions of the Zdanovskii-Stokes-Robinson (ZSR), Leitzke and Stoughton (LSII), Kusik and Meissner (KM), and Pitzer models. From these measurements, new Pitzer mixing ionic parameters are determined and used to predict the solute activity coefficients in the mixture. The obtained results are used to calculate the excess Gibbs energy at total molalities for different ionic-strength fractions y.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Mohamed El Guendouzi, Abdelkebir Errougui,