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应用图解法讨论定性分析中的沉淀溶解平衡问题,早年Charlot曾作过一些工作,近年在分析化学教材中也有所介绍,但都停留在讨论单一金属离子的沉淀溶解平衡问题,比较简单。有的书介绍过金属硫化物的IgC-pH图,却未与其它类型浓度对数图联用,未能就分组条件展开讨论。本文参考了有关文献应用各类浓度对数图及其联用方法,集中讨论了硫化氢系统分组硫化物两组的分组条件,直观地阐明了分组所依据的化学平衡原理。
In the early years, Charlot made some work. In recent years, it has also been introduced in analytical chemistry textbooks. However, it is relatively simple to discuss the problem of the precipitation and dissolution of single metal ions. Some books introduced the IgC-pH diagram of metal sulphides, but not with other types of concentration logarithmic diagram combined, failed to discuss the grouping conditions. This paper refers to the literature on the application of various types of concentration logarithmic diagram and its associated method, focusing on the grouping conditions of the two sets of sulphide groups sulphide hydrogen sulfide system, intuitively clarify the principle of grouping based on chemical equilibrium.