The thermodynamic properties of CsF in the ROH (R = methyl or ethyl)ethyl water mixtures were determined using potentiometric measurements at 298.15 K with the mass fraction of ROH varying from 0.00 to 0.30. The Pitzer, extended Debye-Huckel and Pitzer-Simonson-Clegg equations were successfully utilized to fit the experimental data based on the molality and mole-fraction-composition scale. Except for the standard cell potentials and Pitzer parameters, the mean activity coefficients, osmotic coefficients and standard Gibbs energies of transference of CsF from water to the methanol + water or ethanol + water mixtures have also been discussed herein. (c) 2012 Elsevier B.V. All rights reserved.