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本文用emf法测定HCl+CoCl_2+H_2O体系在298.15K和总离子强度为0.1,0.5,1.0,2.0,3.0,4.0和5.0molekg~(-1)时的HCl活度系数。用Harned方程和Pitzer方程处理了这些实验数据,其结果表明,一直到总离子强度I=5.0molekg~(-1)时,HCl的活度系数仍遵守Harned方程。用三种不同方法求得Pitzer方程中的混合参数θ和ψ。由这些参数求算了CoCl_2的活度系数,三种方法得到的结果在实验误差范围内吻合得很好。
In this paper, the HCl activity coefficient of HCl + CoCl_2 + H_2O system at 298.15K and total ionic strength of 0.1,0.5,1.0,2.0,3.0,4.0 and 5.0molekg -1 were measured by emf method. The experimental data were processed using the Harned and Pitzer equations and the results show that the activity coefficient of HCl still obeys the Harned equation until the total ionic strength I = 5.0molekg -1. Three different methods were used to determine the mixing parameters θ and ψ in the Pitzer equation. The activity coefficients of CoCl_2 were calculated from these parameters, and the results obtained by the three methods agree well with the experimental error.