Abstract
The partial molar volumes, V02, and partial molar heat capacities,C0p,2, at infinite dilution have been determined for the electrolytes tetraphenylphosphonium chloride, tetraphenylphosphonium bromide, sodium tetraphenylborate and sodium bromide in aqueous solution over the temperature range 288.15 to 328.15 K. These results, along with literature data for sodium chloride, were used to derive V02 and C0p,2 values for the electrolyte tetraphenylphosphonium tetraphenylborate (Ph4PBPh4). An extrathermodynamic assumption based on Ph4PBPh4 as the reference electrolyte was used to evaluate the contributions of the cation and anion and thence to establish scales of single-ion volumes and heat capacities. Using the proton as an example, comparisons were made with other single ion scales reported in the literature.
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