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本文用EMF法测定了25.00±0.02℃、恒定总离子强度下HCl+NiCl_2+H_2O体系中HCl活度系数。用Harned和Pitzer方程式处理实验数据,结果表明,一直到总离子强度I=5.0mole·kg~(-1)时,HCl的活度系数仍遵守Harned规则。用三种不同方法求得Pitzer方程式中的混合参数θ和ψ,推算NiCl_2活度系数。计算结果和实验数据在误差范围内吻合得很好。
In this paper, the activity coefficient of HCl in HCl + NiCl 2 + H 2 O system was measured by EMF at a constant total ionic strength of 25.00 ± 0.02 ℃. The experimental data were processed by Harned and Pitzer equations. The results show that the activity coefficient of HCl still obeys the Harned rule until the total ionic strength I = 5.0mole · kg -1. The mixing parameters θ and ψ in the Pitzer equation were calculated by three different methods to calculate the activity coefficient of NiCl_2. The calculated results agree well with the experimental data within the error range.