Abstract
The electrical conductances of solutions of tetrabutylammonium bromide (Bu4NBr), sodium tetraphenylborate (NaBPh4), and sodium bromide (NaBr) in ethylene glycol (EG) (1) + water (2) mixed solvent media containing 0.10, 0.20, and 0.30 mass fractions of EG (w1) have been reported at (298.15, 303.15, 308.15, and 318.15) K. The conductance data have been analyzed by the 1978 Fuoss conductance-concentration equation in terms of the limiting molar conductance (Λ0), the association constant (KA), and the association diameter (R). The ionic contributions to the limiting molar conductances have been estimated using tetrabutylammonium tetraphenylborate (Bu4NBPh4) as the “reference electrolyte”. All of these three electrolytes are found to exist as free ions in the present solvent mixtures within the temperature range from (298.15 to 318.15) K. Although the association constants of the electrolytes do not vary significantly as a function of temperature, the limiting molar conductances of the electrolytes as well as the single-ion conductivity values increase appreciably with temperature.
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