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Conductometric Study of Cesium Bromide in 2-Butanol + Water Mixtures

Sokol V., Tomaš R., Tominic I.

Polish Journal of Chemistry

2008

Vol. 82, nr 8

1585-1585

Molar conductivities of dilute solutions of cesium bromide in binary mixtures of 2-butanol and w ter were measured in the temperature range from 288.15 to 308.15 K at 5 K intervals. The limiting molar conductivity (Deltao) and the ion-pair for ma tion con stant (KA) were de ter mined by the Lee-Wheaton conductivity equation. Thermo dynamic quantities, Gibbs en ergy (DeltaGo), enthalpy (DeltaHo) and entropy (DeltaSo) for the ion-association reaction were de rived from the temperature dependence of KA. The activation energy of the ionic movement (DeltaH‡) was derived from the temperature dependence of Deltao. The obtained thermodynamic quantities, together with Walden product, were interpreted in terms of the ionic size as well as solvent basicity, structure and permittivity.