Abstract
Precision densities and sound velocities for solutions of selected univalent electrolytes and nonelectrolytes in DMSO have been measured at 25°C, and apparent molar isentropic compressibilities and volumes evaluated. The data were extrapolated to infinite dilution to obtain standard state partial molar quantities, K °s,2 , and V °2 . Values of V °2 and K °s,2 for alkali metal halides in DMSO are very similar to those in water. The results confirm conclusions derived from data in water and other nonaqueous solvents that K °s,2 and V °2 for alkali metal halides are strongly dependent on solvent compressibility. K °s,2 becomes more negative and V °2 decreases as solvent compressibility increases. Attempts to determine ionic K °s,2 values suggest that a significant dissymmetry exists between φ4P+ and φ4B− in DMSO, whereas in water and MeOH, these large ions appear to behave similarly. Ionic V °2 values support this conclusion. Steric hindrance in the DMSO molecule is believed to be responsible for this dissymmetry.
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Lankford, J.I., Criss, C.M. Partial molar isentropic compressibilities and volumes of selected electrolytes and nonelectrolytes in dimethylsulfoxide. J Solution Chem 16, 753–765 (1987). https://doi.org/10.1007/BF00652578
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DOI: https://doi.org/10.1007/BF00652578