The thermodynamic characteristics of solutions of Bu4NI in dimethylsulfoxide over a wide concentration range

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 Δ_sol H ^m (Bu₄NI) and of the electrolyte on Δ_sol H ^m 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.