Ionic interactions in the system HBr + BaBr2 + H2O at 25°C

Electromotive-force measurements are reported for mixtures of HBr and BaBr₂ in water at 25°C at constant total ionic strengths. Activity coefficients for HBr were analyzed using Pitzer's equations and Scatchard's neutral-electrolyte treatment. Both methods gave comparable results if the effects of higher-order electrostatic terms on the H⁺–Ba⁺² interactions were included in Pitzer's treatment. Furthermore, the value of the H⁺–Ba⁺² interaction parameter, (s), which should be independent of the anion, is indeed close to that for binary mixtures of these ions having chloride as common ion.