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

摘要

Molar conductivities of NaBr electrolyte in 2-butanol + water mix- tures (w_2-butanol = 0.7, 0.8, 0.9, 0.95) were mesaured in the tem- perature range from 288.15 to 308.15 K at 5 K intervals. By proc- essing the obtained data using the conductivity equations after Fuoss-Hsia and Lee-Wheaton it was not possible to establish a rei- able 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 (K_A) obtained by both equations at different temperatures enable calculation of the stan- dard thermodynamic quantities (ΔH~o andΔS~o) for the association reaction.