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本文采用卤素(F~-,Cl~-,Br~-,I~-)阴离子选择电极与Na~+玻璃电极组成无液接界电池,测定了Nax由H_2O到CH_3OH—H_2O和DMF—H_2O混合溶剂的标准迁移自由能△G_t°。对于卤离子△G_t°的变化规律作了讨论。本文的实验结果与经典的汞齐法比较,符合到±1mv,相当迁移自由能为20calmol~(-1)。对于NaF—CH~3OH—H_2O体系,用氟离子选择电极得到的实验结果与A、K、Covington等的结果能符合得很好。
In this paper, the liquid-free junction cells of halogen (F ~ -, Cl ~ -, Br ~ -, I ~ -) anion selective electrode and Na ~ + glass electrode were used to measure the reaction of Nax from H_2O to CH_3OH-H_2O and DMF-H_2O Solvent standard migration free energy △ G_t °. The variation rules of halide △ G_t ° are discussed. The experimental results of this paper are compared with the classical amalgam method, which is consistent with ± 1mv and the equivalent free energy of migration is 20calmol ~ (-1). For NaF-CH ~ 3OH-H_2O system, the experimental results obtained with the fluoride ion selective electrode are in good agreement with the results of A, K and Covington et al.