Abstract
The electrical conductances of solutions of tetrabutylammonium bromide (Bu4NBr), sodium tetraphenylborate (NaBPh4), and sodium bromide (NaBr) in N,N-dimethylformamide (DMF) (1) + water (2) mixed solvent media containing (0.10, 0.20, and 0.40) mass fraction of DMF have been reported at (308.15, 313.15, 318.15, and 323.15) K. The conductance data have been analyzed by 1978 Fuoss conductance−concentration equation in terms of the limiting molar conductance (Λ0), the association constant (KA), and the association diameter (R). The limiting ionic conductances have been estimated from an appropriate division of the limiting molar conductivity of the “reference electrolyte” Bu4NBPh4. All of these three electrolytes are found to exist as free ions in the present solvent mixtures within the temperature range from (308.15 to 323.15) K. Although association constants of the electrolytes do not vary significantly as a function of temperature, the limiting molar conductances of electrolytes as well as single-ion conductivity values increase appreciably with temperature.
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