电导法测定水溶液中NaBr与KBr的活度系数

The Measure for the Active Coefficients of the Mixed Electrolyte NaBr and KBr in H_2O by Electric Conductivity

应用电导法分别测定水溶液中NaBr、KBr的电导率,以及混合电解质NaBr和KBr的电导率;计算了电解质的活度系数。结果表明,温度一定时,在稀溶液范围内,活度系数随浓度的增加而降低;浓度一定时,随温度的升高而降低;混合电解质的活度系数与单一电解质的活度系数相近,并不存在简单的加和关系。

The electric conductivity of NaBr, KBr in H2O, together with the mixed electrolyte of NaBr and KBr, is measured by the conductivity method. The activity coefficients of electrolytes are calculated. The results show that when the temperature is constant in diluting solution, the activity coefficient decreases with the increase of the concentration. Concentration decreases with temperature increasing. The activity coefficient of mixed electrolyte is similar to activity coefficients of single electrolytes. There is no simple adding relationship.