Abstract
The mean activity coefficients of KBr in the KBr+K2B4O7+H2O ternary system were determined at the total ionic strength ranging from 0.0100 mol·kg–1 to 2.0000 mol·kg–1 at 298.15 K by an electromotive force method from the cell without liquid junction: K-ISE|KBr(m1),K2B4O7(m2)|Br-ISE. The mean activity coefficients of KBr were compared with those different ionic strength fractions yB of K2B4O7 with yB = (0.8, 0.6, 0.4, 0.2, and 0). The experimental results showed that K-ISE and Br-ISE in this work had a good Nernst response, and the mean activity coefficients of KBr in KBr+K2B4O7+H2O mixtures were calculated using the Nernst equation. Mixing interaction parameters of θBr–·B4O5(OH)42– and φK+·Br–·B4O5(OH)42– in Pitzer’s equation, which had not been reported, were evaluated from the present measurements of the mean activity coefficients of KBr. Then the osmotic coefficients, water activity, and excess Gibbs free energy of this system were calculated by the Pitzer’s equations.
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