Abstract
The limiting molar conductances Λo of hydrochloric acid and potassium chloride in 2.5, 5, 10, and 15 mol% 1,4-dioxane-water mixtures were determined at 25°C as a function of pressure up to 196.1 MPa from the conductances measured in the dilute concentration range. The value of Λo(HCl) was two to three times larger than that of Λo(KCl) in each solvent mixture as well as in pure water. The excess proton conductance, as estimated by the equation [λ oE =Λo(HCl)−Λo(KCl)], increased with pressure in each solvent mixture, although the value of λ oE itself decreased rapidly with an increase in the dioxane content. The rate of increase in λ oE with pressure was not so large in dioxane-water mixtures as in pure water, and became smaller with an increase in the dioxane content in contrast to the cases of ethanol-water and t-butyl alcohol (TBA)-water mixtures. These results are discussed in terms of the difference between a dioxane and an ethanol or a TBA molecule in ability to stabilize the hydrogen-bonded networks of water in the water-rich region.
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Tada, Y., Ueno, M. & Shimizu, K. Pressure effect on proton jumps in dioxane-water mixtures at 25°C. J Solution Chem 24, 343–355 (1995). https://doi.org/10.1007/BF01150873
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DOI: https://doi.org/10.1007/BF01150873