Partial molal heat capacities and volumes of electrolytes in nonaqueous solvents and ion–solvent interactions

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Abstract
A flow heat capacity calorimeter and a flow vibrating tube densimeter have been used to measure the apparent molal heat capacities and volumes of several alkali metal and tetra-alkylammonium halides in anhydrous N,N-dimethylformamide (DMF), and the standard state partial molal heat capacities and volumes, text-decoration:overline C 0 p2 and text-decoration:overline V 0 2, have been evaluated. A comparison of the data with similar data in water and methanol show that text-decoration:overline C 0 p2 for electrolytes in the three solvents behaves quite differently. The alkali metal halides generally exhibit negative heat capacities in water and methanol and positive heat capacities in DMF at 25°C. The temperature dependence of text-decoration:overline V 0 2 in the three solvents is similar to that of text-decoration:overline C 0 p2. Both text-decoration:overline C 0 p2 and text-decoration:overline V 0 2 have been divided into ionic contributions and the values discussed in terms of ion-solvent interactions.

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