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Conductometric Study of Cesium Bromide in Aqueous Butan-2-ol of Lower Mass Fraction

Molar conductivities of dilute solutions of cesium bromide in binary mixtures of butan-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 KA. The activation enthalpy of the charge transport (ΔH ‡ ) was derived from the temperature dependence of Λo. The obtained thermodynamic quantities, together with Walden product, were discussed in terms of solvent basicity, structure permittivity and viscosity.

cesium bromide; butan-2-ol + water mixtures; association to ion-pairs; thermodynamic quantities

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