Abstract
The mean activity coefficients of KCl in a KCl-K2B4O7-H2O ternary system were experimentally determined at 308.15 K by the electromotive force measurement(EMF) via a battery cell without a liquid junction: K-ISE|KCl(m 1), K2B4O7(m 2)|Cl-ISE(ISE=ion selective electrode) in a total ionic strength of from 0.01 mol/kg to 1.00 mol/kg at different ionic strength fractions of K2B4O7 with y B=0, 0.200, 0.400, 0.600 and 0.800. K-ISE and Cl-ISE presented a good Nernst effect, which implies that this method could be used to measure the activity coefficients of an electrolyte in the above system. The Harned rule was fitted to the experimental data, the Harned coefficients and the Pitzer single-salt ion parameters of KCl were evaluated, and the relationship diagrams between the mean activity coefficient of KCl and the ionic strength fraction(y B) were drawn. The mean activity coefficients of KCl(γ ±KCl) decreased monotonically with the increase of I. The experimental results obeyed the Harned rule well.
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Supported by the Open Fund of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, China(No.PLC201204), the National Natural Science Foundation of China(Nos.41373062, 40973047) and the Specialized Research Fund for the Doctoral Program of Higher Education of China(No.20125122110015).
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Zhong, Sy., Sang, Sh. & Zhang, Jj. Mean activity coefficients of KCl in the KCl-K2B4O7-H2O ternary system at 308.15 K by EMF method. Chem. Res. Chin. Univ. 29, 1189–1192 (2013). https://doi.org/10.1007/s40242-013-3139-y
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DOI: https://doi.org/10.1007/s40242-013-3139-y