Determination of the Activity Coefficients of NaCl in the System NaCl–NH4Cl–H2O

被引:1
|
作者
Xiaoyan Ji
Xiaohua Lu
Shaowu Li
Luzheng Zhang
Yanru Wang
Jun Shi
机构
[1] Nanjing University of Chemical Technology,
来源
关键词
Activity coefficients; ion-selective electrode (ISE); Pitzer equation; sodium chloride; ammonium chloride;
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摘要
Using ion-selective electrode(s) (ISE) the activity coefficients of NaCl in the system NaCl–NH4Cl–H2O at 10, 25, and 40°C were measured by a computer-controlled automatic titration system. The ionic strength fractions of NH4Cl were 0.2, 0.4, 0.6, and 0.8, respectively. It was found that the influence of the NH4+ cation on the Na glass ISE was small enough to be neglected up to 3.0 mol-kg−1. The Pitzer equation was adopted to calculate the activity coefficients of NaCl in this system and compared with the experimental data. Comparison of results indicates that the Pitzer parameters correlated from solubility data are suitable for calculating the activity coefficients for this system within the saturated solutions.
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页码:463 / 473
页数:10
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