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采用电动势法测定了在298.15K下NaBr-Na2B4O7-H2O体系中NaBr平均活度系数,混合溶液的离子强度为0.01～0.50 mol/kg,分析了混合溶液中NaBr平均活度系数与Na2B4O7离子强度分数的关系。研究结果表明,测定的NaBr平均活度系数是可靠的,并在一定浓度下该NaBr平均活度系数随Na2B4O7离子强度分数的增大而增大。应用测定的NaBr平均活度系数拟合了Pitzer方程混合离子作用参数。
The average activity coefficient of NaBr in NaBr-Na2B4O7-H2O system at 298.15K was determined by electromotive force method. The ionic strength of the mixed solution was 0.01-0.50 mol / kg. The average activity coefficient of NaBr and the ionic strength of Na2B4O7 in the mixed solution were analyzed. Relationship. The results show that the average activity coefficient of NaBr is reliable, and the average activity coefficient of NaBr increases with the increase of ionic strength of Na2B4O7 at a certain concentration. The measured NaBr average activity coefficients fit Pitzer equation mixed ion action parameters.