Effect of 1,4-dioxane on the conductance and ion-pairing of hydrogen chloride in wet and dry methanol mixtures at 25 °C

Abstract

The molar conductances of solutions of HCl in wet (74% methanol–26% 1,4-dioxane) and (54% methanol–46% 1,4-dioxane) mixtures at 25 °C have been measured. The data have been analysed by the expanded Fuoss–Hsia equation. The pK_d and Λ_∞ in the anhydrous binary solvent systems have been determined. The influence of water on the percentage excess proton mobility with respect to the potassium ion has also been considered. A tentative interpretation of the observed trend is suggested, based on the formation of a hydrogen-bonded associate between methanol and 1,4-dioxane molecules.