Activity Coefficients in Quaternary Systems at 298.15 K: RbCl + MeOH + EtOH + H₂O and CsCl + MeOH + EtOH + H₂O Systems

Abstract

Activity coefficients of RbCl or CsCl in methanol + ethanol + water were determined at 298.15 K by the cells containing ion-selective electrodes (ISEs). The molalities of RbCl and CsCl are up to approximately 1 mol•kg −1 in the mixed solvents, and the mass fractions of five aqueous MeOH/EtOH mixtures studied were (5/5, 10/5, 5/10, 10/10, and 15/15) %. The experimental data were optimized using the extended Debye−Huckel, the Pitzer, and the modified Pitzer equations. The results of the apparent standard electromotive force E 0 * of the three equations are in good agreement. The mean activity coefficients and the standard Gibbs energy of transfer of RbCl or CsCl from pure water to mixed solvents (MeOH + EtOH + water) were also calculated.

Density and Partial Molar Volumes of the Liquid Mixture Water + Methanol + Ethanol + 2-Propanol at 298.15 K and 0.1 MPa

“…Further, molecular simulation results for the density of 10 compositions of the quaternary mixture were reported in previous work . The volumetric properties of the ternary subsystem water + methanol + ethanol have been studied thoroughly in the literature, ,,− and Zarei et al . as well as Mori et al proposed Redlich–Kister- and NRTL-type correlations for its excess volume.…”

Activity Coefficients of CsCl in PEG 200–H2O and PEG 600–H2O Mixtures at 298.15 K

“…On the basis of the McMillan-Mayer theory, 36 (13) where g EN and g EEN are pair and triple Gibbs energy interaction parameters.…”

“…8 Hernańdez-Luis et al explored the mean activity coefficients of LiCl/NaCl/KCl + PEG 4000 + H 2 O systems in the temperature range from 288.15 to 308.15 K. 9−11 In our previous work, the phase behavior of aqueous two phase systems composed of Cs 2 SO 4 + PEG + H 2 O 12 was investigated. Moreover, the activity coefficients of Rb + /Cs + in amide/amino acid/polyhydroxy alcohol−water mixture solutions 13,14 were also concerned. In this article, the ternary systems CsCl + PEG 200/PEG 600 + H 2 O at 298.15 K were investigated by the electromotive force method.…”