Electrical Conductivity of Tetrabutylammonium Bromide, Sodium Tetraphenylborate, and Sodium Bromide in the Presence of Dimethyl Sulfoxide + Water Mixtures at Different Temperatures (298.15, 303.15, 308.15, and 313.15) K

At (298.15, 303.15, 308.15, and 313.15) K, electrical conductances of the salts, namely, tetrabutylammonium bromide (Bu₄NBr), sodium tetraphenylborate (NaBPh₄), and sodium bromide (NaBr) in dimethyl sulfoxide (DMSO) + water (H₂O) mixed solvent media with 0.10, 0.20, 0.30, and 0.40 mass fractions of DMSO were obtained. The 1978 Fuoss equation was used to analyze the experimental conductance data. The “reference electrolyte” tetrabutylammonium tertraphenylborate (Bu₄NBPh₄) was used to estimate the limiting ionic conductances. Our analysis found that all three electrolytes predominantly occur as free ions in solvent mixes at 298.15–313.15 K. The electrolyte association constant does not show noteworthy changes as the temperature varies. However, the electrolytes’ limiting molar conductances and single-ion conductivity values rise noticeably with the increase in temperature. A deviation form ideal behavior for Walden products of these salts were observed when the temperature or solvent composition were changed.