Electromotive Force Of Fluorinated Rubidium / Fluoride Of Cesium In The Thermodynamic Properties Of Aliphatic Alcohol + Water Mixed Solvents

It is important to study the thermodynamic properties of electrolyte solutions. The thermodynamic properties of electrolyte are activity coefficients, osmotic coefficients, standard Gibbs energies of transfer and so on. This paper studies the thermodynamic properties of the rare alkali metal fluoride, RbF and CsF in alcohol (methanol, ethanol, ethylene glycol, glycerol)+ water mixed solvent systems.The cells used in this work are galvanic cell without liquid junction with only one fluid:Rb/Cs-ISE｜RbF/CsF (m), H2O｜F-ISEⅠRb/Cs-ISE｜RbF/CsF (m), alcohol), H2O(1-w)｜F-ISEⅡRubidium or cesium ion-selective electrode (Rb-ISE or Cs-ISE) is the anode. F-ISE is the cathode, w is the mass fraction of alcohol, m is the molality of RbF or CsF. The cells were carried out at different molalities of RbF or CsF in mixed solvent. The sisterms studied are as follows:RbF/CsF+Methanol (w=0.10,0.20,0.30,0.40)+WaterRbF/CsF+Ethanol (w=0.10,0.20,0.30,0.40)+WaterRbF/CsF+Ethylene glycol (w=0.10,0.20,0.30,0.40)+WaterRbF/CsF+Glycerol (w=0.10,0.20,0.30,0.40)+WaterThe experimental data were calculated by Pitzer and Pitzer-Simonson-Clegg models. Combined Nernst equation with single 1-1 electrolyte Pitzer equation, we obtained the standard cell potentials and Pitzer parameters. From these, the mean activity coefficients of RbF or CsF, osmotic coefficients of the mixtures and standard Gibbs energies of transfer of RbF or CsF from water to methanol/ethanol/ethylene glycol/glycerol+ water mixtures were calculated.The values from this work filled the thermodynamic values of the RbF or CsF. These will help the forther studis of the thermodynamic properties of RbF and CsF.