Activity Coefficients for CsBr plus MeOH/EtOH + H2O Ternary Systems Using Potentiometric Measurements at 298.15 K

In this paper, the mean activity coefficients for CsBr, as well as the osmotic coefficients, the excess Gibbs free energies, the Gibbs energies of transference, and the primary hydration in different MeOH-water and EtOH-water mixtures at 298.15 K are calculated by potentiometric measurements. The cell used in this work contains two ion selective electrodes (ISEs): Cs-ISE vertical bar CsBr(m), ROH(w), H2O(1 - w)vertical bar Br-ISE (R = Me and Et), and the mass fraction of ROH in the mixture (w) was varied between 0 and 0.3 in 0.1 unit steps. The experimental data were correlated very well by the thermodynamics equations of Pitzer, modified Pitzer, and Debye-Huckel models.