engleski

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

Molar conductivities of dilute solutions of cesium bromide in binary mixtures of 2-butanol and water were measured in the temperature range from 288.15 to 308.15 K at 5 K intervals. The limiting molar conductivity (lambda_o) and the ion-pair formation constant (K_A) were determined by the Lee-Wheaton conductivity equation. Thermodynamic quantities, Gibbs energy (deltaG^o), enthalpy (deltaH^o) and entropy (deltaS^o) for the ion-association reaction were derived from the temperature dependence of K_A. The activation energy of the ionic movement was derived from the temperature dependence of lambda_o. The obtained thermodynamic quantities, together with Walden product, were interpreted in terms of the ionic size as well as solvent basicity, structure and permittivity.

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

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