Role of solvent permittivity in estimation of electrolyte activity coefficients on the basis of the mean spherical approximation. Technical report
Role of solvent permittivity in estimation of electrolyte activity coefficients on the basis of the mean spherical approximation. Technical report
复制标题
溶剂介电常数在基于平均球近似估计电解质活度系数中的作用。
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
A. C. Tikanen
中科院分区：
文献类型：
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作者：
W. Fawcett;A. C. Tikanen
基于限制版本的平均球近似的电解质溶液的模型的修改版本被施加到估计的碱金属卤化物的水溶液的平均离子活度系数。修改涉及使用溶液的实际介电常数，而不是纯溶剂的介电常数。在钠盐和钾盐的情况下，理论和实验之间的拟合是可能的，在宽浓度范围高达2.5 M，使用一个可调参数，即单一的有效离子直径。该模型的局限性，特别是相对于系统与弱离子配对，进行了讨论。
A modified version of the model for electrolyte solutions based on the restricted version of the mean spherical approximation is applied to estimate mean ionic activity coefficients for aqueous solutions of the alkali metal halides. The modification involves using the actual dielectric permittivity of the solution rather than the permittivity of the pure solvent. In the case of sodium and potassium salts, fits between theory and experiment are possible over wide concentration ranges up to 2.5 M using one adjustable parameter, namely, the single effective ionic diameter. Limitations of the model, especially with respect to systems with weak ion pairing, are discussed.