Abstract
Heat capacities and densities of solutions of NaI in mixtures of N,N-dimethylformanide (DMF) with isobutanol, formamide, acetone, tetrahydrofuran, ethylene glycol, 2-methoxyethanol, n-propanol and benzo-15-crown-5-ether have been measured at 25°C. The apparent molar volumes of NaI in mixtures of DMF with isobutanol, formamide, ethylene glycol, n-propanol, and 2-methoxyethanol increase with the amount of these non-electrolytes, while in the systems containing acetone, tetrahydrofuran and benzo-15-crown-5 ether a decrease is observed. The apparent molar heat capacity of NaI in the system containing the crown ether is higher than that in pure DMF. In all other cases Cp,ϕ of NaI decreases with the amount of non-electrolyte. Finally, the non-ideal contributions to heat capacity and volume as a result of the interaction between pairs of unlike solutes, respectively cXY and vXY with X=NaI and Y=non-electrolyte, are calculated.
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On leave from the University of Lódz, Department of Physical Chemistry, ul. Nowotki 18, 91-416 Lódz, Poland.
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Piekarski, H., Somsen, G. Heat capacities and volumes of NaI in mixtures of dimethylformamide and several non-electrolytes. J Solution Chem 19, 923–936 (1990). https://doi.org/10.1007/BF00653077
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DOI: https://doi.org/10.1007/BF00653077