Conductometric study of potassium bromide in 2-butanol plus water mixtures

摘要

Molar conductivities of dilute solutions of KBr in 2-butanol + water mixtures with an alcohol mass fraction of 0.70, 0.80, 0.90 and 0.95 were determined at five temperatures from 288.15 to 308.15 K. Data were treated by the Lee-Wheaton conductivity model and its parameters, the limiting molar conductivity (Lambda(o)) and the association constant (K-A), were evaluated. Thermodynamic quantities for the ion-association reaction and for the process of charge transport were derived from the temperature dependence of the parameters and, together with the Walden product, interpreted in terms of the ionic size as well as solvent basicity, structure and permittivity.