POTENTIOMETRIC AND CONDUCTOMETRIC STUDIES OF NAI SOLUTIONS IN WATER PLUS ISOPROPANOL MIXTURES AT 298.15-K

Electrical conductivities of NaI solutions and electromotive forces of the cell glass electrode (Na)\NaI\AgI\Ag in water+iso-propanol mixtures over a wide range of the mixed solvent composition were measured at 298.15 K. Values of molar limiting conductances LAMBDA0, Walden products LAMBDA0eta, association constants K(A) and Gibbs energies of transfer of NaI DELTAG(t)0 were determined. Effects of the ionic association and the asymmetry potential of the glass electrode on the Gibbs energies of transfer were estimated. The standard enthalpies of solution, obtained previously, were recalculated taking ion-pair formation into account. Values of standard enthalpies and entropies of transfer of electrolyte were also determined.