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Abstract
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Molar conductances for sodium chloride have been measured in the solvent system mannitol-
water covering the solvent composition range from pure water to saturated aqueous
mannitol at temperature from 293.15 to 313.15 K at 5 K intervals. According to the
Fuoss–Justice conductance equation, limiting molar conductance Λ∞ , association constants
KA , and the Walden products were obtained and their variations were in conformity
with the thermodynamics study of solvent effect. The Eyring’s activation enthalpy of
charge transport ΔH† was derived and the results have stipulated that this kinetic procedure
depends only on the solvent properties. Ion association thermodynamic quantities, Gibbs
energy ( ΔG◦ ), enthalpy ( ΔH◦ ), and entropy ( ΔS◦ ) were also calculated and their interpretation
were further supported by other methods. Besides, by appropriate splitting of Gibbs’
energy of association into electrostatic and non-electrostatic contributions.
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