Conductometric Study on Potassium Chloride in Aqueous Solutions of Sucrose at Different Temperatures

Abstract

The conductivities of aqueous KCl + sucrose solutions were measured at KCl concentrations up to 0.0067 mol dm⁻³ and sucrose concentrations up to saturation, at temperatures from 293.15 K to 313.15 K. The data were correlated and analyzed by using the low-concentration chemical model (lcCM) version of the Fuoss–Justice equation. The calculated Walden products and the \(\Lambda^{\infty }\) and \(K_{\text A}\) are in accordance with the previous studies and the results agree well with the Lee–Wheaton model. Eyring enthalpies of activation for charge transport were evaluated. Calculated thermodynamic quantities for ion association (\(\Delta G^{^\circ } ,\Delta H^{^\circ } ,\Delta S^{^\circ }\)) are consistent with the results from other methods (exergonic, endothermic, and enhanced degree of freedom). Splitting the standard Gibbs energy change, into coulombic and non-coulombic terms, shows that the electrostatic contribution is of major importance.