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用电动势法测定了298.15K时,由Na~+和Cl~-离子选择电极组成的电池在NaCl-CH_3OH-H_2O混合体系中的电动势,用扩展的Debye-H(?)ckel方程和Pitzer方程关联不同溶剂组成下电动势的实验值,得到电池的标准电动势值和NaCl在混合溶剂中的活度系数.将Pitzer-Simonson方程应用于含离子缔合体系,求出NaCl在混合溶剂中的缔合常数,结果表明NaCl在甲醇含量为60%时,可能已有离子对生成.
The electromotive force of a battery composed of Na ~ + and Cl ~ - ion selective electrodes in NaCl-CH_3OH-H_2O mixed system was measured by electromotive force method at 298.15K, which was related to the Pitzer equation by the extended Debye-H (?) Ckel equation The experimental values of electromotive force under different solvent compositions were obtained, and the standard electromotive force value and the activity coefficient of NaCl in the mixed solvent were obtained.The Pitzer-Simonson equation was applied to the ion-association system and the association constant of NaCl in the mixed solvent , The results show that when the methanol content of 60% NaCl, there may have been ion pair formation.