Abstract
The Δ H ion of the process 2H 2O x → H 3O + x + OH - x has been calorimetrically measured in dimethylsulfoxide (DMSO)—water solutions for X DMSO molar ratios ranging between 0 and 0.8 at T = 25°C. The Δ H ion values show a well-pronounced minimum at X DMSO = 0.5, for which composition the ionization reaction is 4.28 kcal/mole less endothermic than in pure water. The combination of the Δ H ion data with the existing p K a/1 values reveals several features of DMSO—water mixtures with regard to the ionic solvating power and the mixed solvent structure.
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