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The Study of Activity Coefficients on the Ternary System of NaCl-KCl-H2O at 35℃
Li Zhiguang,Huang Hongjun*,Yan Jun
Author NameAffiliationE-mail
Li Zhiguang Section of Physi-Chemistry, Mchenical Engineering College, Shijiazhuang 050003  
Huang Hongjun* Section of Physi-Chemistry, Mchenical Engineering College, Shijiazhuang 050003 hhjrfz@sohu.com 
Yan Jun Section of Physi-Chemistry, Mchenical Engineering College, Shijiazhuang 050003  
Abstract:
That the activity coefficient of mixed electrolyte solution is determined using ISE has become a simple and practicable method. There are a lotofNa+、K+、Cl-、SO42-and a little Ca2+in the seawater and saline. The study of these ionic mean activity coefficients is very important in the designing and exploiting technology for the industry of producing salt, seawater desalinization and so on. The object of this text is the ternary system of NaCl-KCl-H2O at 35℃. The experiment device of determining the ionic average activity coefficients of electrolyte solutions has been set up. The electromotive force of pure NaCl and KCl aqueous solution has been determined using the ion selective electrode at 35℃. The electrode constants have been regressed. The mean relative error about the activity coefficient of KCl solution is 0.9% between the calculated value of Pitzer equation and the calculated value of regression. The mean relative error about the activity coefficient of NaCl solution is 1.5% between the calculated value of Pitzer equation and the calculated value of regression. The linearity connection of the electromotive force vs the logarithm value of activity is very good within the experiment concentration. This indicates the determination method and the experiment equipment are reliable and the determined data are believable. The ionic average activity coefficients of NaCl and KCl have been determined in the ternary mixture systemofNaCl-KCl-H2O at 35℃ using the ion selective electrode. The concentration of the mixed electrolyte solutions is 0.1~1.5 mmol/L in six groups altogether. The interaction parameters of the Pitzer equation have been regressed. The maximal relative error between the experiment value and the calculated value is 5.6% and the mean relative error is 2.3%.
Key words:  Sodium chloride  Potassium chloride  Activity coefficient
FundProject:
三元体系NaCl-KCl-H2O35℃活度系数的研究
李志广,黄红军*,闫军
摘要:
研究了35℃ NaCl-KCl-H2O三元体系的活度系数.用Na+、 K+和Cl-的离子选择性电极分别测得了(0.1~ 1.5 mmol/L)不同离子强度下该体系中NaCl和KCl的平均活度系数.回归了该体系Pitzer方程的相互作用参数.实验值与计算值最大相对误差为5.6%,而平均相对误差为2.3%.
关键词:  氯化钠  氯化钾  活度系数
DOI:10.1088/1674-0068/15/6/476-480
分类号: