SCHEDULED MAINTENANCE
Partial molal heat capacities and volumes of electrolytes in nonaqueous solvents and ion–solvent interactions
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, C0p2 and V02, have been evaluated. A comparison of the data with similar data in water and methanol show that C0p2 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 V02 in the three solvents is similar to that of C0p2. Both C0p2 and V02 have been divided into ionic contributions and the values discussed in terms of ion-solvent interactions.
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