Mean Activity Coefficients of NaCl in NaCl + SrCl2 + H2O Ternary System at 298.15 K Determined by Potential Difference Measurements

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• 作者：Mei-Fang Zhou ; Shi-Hua Sang ; Qing-Zhu Liu ; Dan Wang ; Chao Fu
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2015
• 出版时间：November 12, 2015
• 年：2015
• 卷：60
• 期：11
• 页码：3209-3214
• 全文大小：326K
• ISSN：1520-5134

文摘

The mean activity coefficients for NaCl in the (NaCl + SrCl₂ + H₂O) ternary system were determined by electrode potential measurements of the cell without liquid junction: Na鈥搃on selective electrode (ISE)|NaCl (m_A), SrCl₂ (m_B), H₂O|Cl鈥搃on selective electrode (ISE) at the total ionic strengths ranging from (0.0100 up to 4.0000) mol路kg^鈥? at 298.15 K for different ionic strength fractions y_B of SrCl₂ with y_B = (0.0, 0.2, 0.4, 0.6, and 0.8). The activity coefficient results were interpreted based on the Pitzer model. The Pitzer ion interaction parameters 胃_{Na⁺路Sr²⁺} and 蠁_{Na⁺路Cl^{鈥?/sup>路Sr2+}} were calculated. Furthermore, those parameters obtained with the Pitzer model were used to calculate the values of the mean activity coefficients of SrCl₂. In addition, the osmotic coefficients, solvent activity, and the excess Gibbs free energy for the mixed electrolyte system were also studied.