engleski

Conductometric Study of Sodium Chloride in Aqueous 2- methylpropan-2-ol of Mass Fraction 0.10, 0.30, 0.50, 0.70, 0.80 and 0.90

Molar conductivities of dilute solutions of sodium chloride in binary mixtures of 2-methylpropan-2-ol and water were measured in the temperature range from 288.15 to 308.15 K at 5 K intervals. The limiting molar conductivity (Λ o ) and the ion- pair formation constant (K A ) were determined by the Lee- Wheaton conductivity equation. Thermodynamic quantities, Gibbs energy (ΔG°), enthalpy (ΔH°) and entropy (ΔS°), for the ion-association reaction were derived from the temperature dependence of K A . The activation enthalpy of the charge transport (ΔH*) was derived from the temperature dependence of Λ o . The obtained thermodynamic quantities, together with Walden product, were discussed in terms of solvent basicity, structure permittivity and viscosity.

sodium chloride; 2-methylpropan-2-ol + water mixtures; association to ion-pairs; thermodynamic quantities

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