Abstract
The integral heats of solution of Bu4NI in dimethylsulfoxide (DMSO) were measured at 298.15, 313.15, and 328.15 K and concentrations from dilute to saturation. The standard enthalpies and heat capacities of solution and solvation of Bu4NI in DMSO at various temperatures and the \( \bar C_p^o (Bu_4 N^ + ) \) value at 298.15 K were calculated. The obtained and literature data were used to consider the influence of the nature of solvents on ΔsolHm(Bu4NI) and of the electrolyte on ΔsolHm in dimethylsulfoxide at 298.15 K. The dynamic viscosity and density of the Bu4NI-DMSO system were determined at various concentrations and temperatures. The Eyring equation was used to calculate the activation energy of viscous flow at all the concentrations studied.
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