Abstract
Standard enthalpies of solutions of sodium bromide, potassium bromide, tetrabutyl phosphonium bromide, tetraphenyl phosphonium bromide, and sodium tetraphenyl boron have been measured in 20%, 44.5%, and 64.5% dioxane–water mixture. On the extra thermodynamic assumption ΔΔHs(Ph4P+) = ΔΔHs(BPh4) single ion enthalpies of transfer from water to dioxane–water mixtures have been calculated for various ions.

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