Activity Coefficients of Electrolytes in the NaCl + Na2SO4 + H2O Ternary System from Potential Difference Measurements at (298.15, 303.15, and 308.15) K
Activity Coefficients of Electrolytes in the NaCl + Na2SO4 + H2O Ternary System from Potential Difference Measurements at (298.15, 303.15, and 308.15) K
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DOI：
10.1021/je2008457
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发表时间：
2011-12-01
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影响因子：
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通讯作者：
Ion, Ion
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文献类型：
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作者：
Sirbu, Florinela;Iulian, Olga;Ion, Ion
电位差测量已用于获得 NaCl 和 Na2SO4 在其水溶液中的平均离子活度和渗透系数。此外，以钠为常见离子的 NaCl-Na2SO4-H2O 三元体系中 NaCl 的平均离子活度系数已通过细胞电位测量确定：Na-ISE/NaCl (m(NaCl))； Na2SO4 (m(Na2SO4))/Ag/AgCl 与参比池组合：Na-ISE/NaCl (I = m(NaCl) + 3m(Na2SO4))、AgCl(s)/Ag。测量是在Na2SO4离子强度比y(Na2SO4)为(0.0、0.2、0.4、0.6、0.8和1.0)、恒定总离子强度I为(0.1、0.5、1.0、2.0、3.0和4.0)mol.kg(-1)和温度为(298.15, 303.15, 308.15) K. 将实验得到的 NaCl 平均离子活度系数与 Harned 法则以及 Scatchard 和 Pitzer 模型进行相关分析。根据 NaCl 的痕量活度系数数据计算混合的过量自由吉布斯能，并根据不同温度和总离子强度下的系统组成进行分析。
Potential difference measurements have been used to obtain the mean ionic activity and osmotic coefficients of NaCl and Na2SO4 in their aqueous solutions. Also, the mean ionic activity coefficients of NaCl in NaCl-Na2SO4-H2O ternary system with sodium as a common ion have been determined from cell potential measurements using: Na-ISE/NaCl (m(NaCl)); Na2SO4 (m(Na2SO4))/Ag/AgCl combined with the reference cell: Na-ISE/NaCl (I = m(NaCl) + 3m(Na2SO4)), AgCl(s)/Ag. The measurements were made at ionic strength ratios for Na2SO4, y(Na2SO4), of (0.0, 0.2, 0.4, 0.6, 0.8, and 1.0), at constant total ionic strengths, I, of (0.1, 0.5, 1.0, 2.0, 3.0, and 4.0) mol.kg(-1) and at temperatures of (298.15, 303.15, and 308.15) K. The experimental mean ionic activity coefficients of NaCl were correlated and analyzed with the Harned rule and Scatchard and Pitzer models. The excess free Gibbs energies of mixing were calculated from the trace activity coefficient data of NaCl and analyzed versus system composition at different temperatures and total ionic strengths.