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Thermodynamics of the Association Reaction of Na+ and Br- Ions in (70, 80, 90, and 95 Mass per Cent) 2-Butanol + Water Mixtures

Molar conductivities of NaBr electrolyte in 2-butanol + water mixtures (w(2-butanol) = 0.7, 0.8, 0.9, 0.95) were mesaured in the temperature range from 288.15 to 308.15 K at 5 K intervals. By processing the obtained data using the conductivity equations after Fuoss-Hsia and Lee-Wheaton it was not possible to establish a reliable value for the distance of the ions in the ion-pairs formed (R). The processing was therefore repeated using the same equations with R=q(Bjerrum). The association constants (KA) obtained by both equations at different temperatures enable calculation of the standard thermodynamic quantities (DH and DS) for the association reaction. The obtained thermodynamic quantities, together with the limiting molar conductivity, were compared with the analogous data from literature for HBr electrolyte in the same mixtures, and for NaBr electrolyte in t-butanol + water mixtures.

conductivity ; sodium bromide ; 2-butanol - water mixtures ; ion-association ; thermodynamic quantities

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