Mean Activity Coefficients of KCl in the KCl-K2B4O7-H2O Ternary System at 308.15 K by EMF Method

doi:10.1007/s40242-013-3139-y

Chemical Research in Chinese Universities ›› 2013, Vol. 29 ›› Issue (6): 1189-1192.doi: 10.1007/s40242-013-3139-y

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Mean Activity Coefficients of KCl in the KCl-K₂B₄O₇-H₂O Ternary System at 308.15 K by EMF Method

ZHONG Si-yao^1,2,3, SANG Shi-hua^1,2,3, ZHANG Jun-jie^1,3

1. College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, P. R. China;
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, P. R. China;
3. Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions, Chengdu University of Technology, Chengdu 610059, P. R. China

Received:2013-03-26 Revised:2013-06-20 Online:2013-12-01 Published:2013-08-21
Contact: SANG Shi-hua E-mail:sangsh@cdut.edu.cn
Supported by:
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).

Abstract

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(m₁), K₂B₄O₇(m₂)|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 K₂B₄O₇with 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.

Key words: Activity coefficient, Electromotive force measurement, Ion selective electrode, Potassium chloride, Pota-ssium borate

ZHONG Si-yao, SANG Shi-hua, ZHANG Jun-jie. Mean Activity Coefficients of KCl in the KCl-K₂B₄O₇-H₂O Ternary System at 308.15 K by EMF Method[J]. Chemical Research in Chinese Universities, 2013, 29(6): 1189-1192.

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Mean Activity Coefficients of KCl in the KCl-K₂B₄O₇-H₂O Ternary System at 308.15 K by EMF Method

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