HBr +(Bu)4NBr + H2O at 25°C. Application of Pitzer's equations

Abstract

Measurements were made on the title system using an e.m.f. cell, without liquid junction, of the type: Pt, H₂(g, 1 atm)|HBr(m₁), (Bu)₄NBr(m₂)|AgBr, Ag at 25°C in the total molality ranges of m, where m=m₁+m₂, equal to 0.1, 0.25, 0.5 and 1.0 mol kg^–1. Harned's Rule has been tested for the variation of the activity coefficients in these mixtures of electrolytes. The results are discussed at low dilution (0.1 mol kg^–1) in terms of the specific interaction coefficient, B_{(Bu)4N⁺, Br^–}, as well as interpreted in terms of Pitzer's equation for the total molality range under investigation.