Potentiometric Investigation of the Thermodynamic Properties of Mixed Electrolyte Systems at 298.2 K: CsF + CsBr + H₂O and CsF + CsNO₃ + H₂O

CsF + CsBr + H₂O and CsF + CsNO₃ + H₂O mixed-electrolyte systems were investigated by the potentiometric method. The experimental data were modeled by connecting the Nernst equation with the Pitzer or Harned model. The mean ionic activity coefficients of CsF, γ_±A, and CsBr or CsNO₃, γ_±B, were calculated. Moreover, other properties, such as mean ionic activity coefficients in pure and trace quantities (γ⁰ and γ^tr), osmotic coefficients, Φ, excess Gibbs energies, G^E, and the change in excess Gibbs energy of the mixture, ΔG_m^ex, were obtained and discussed.