硫化铋溶解性的热力学研究

Study of Dissolubility of Bismuthous Sulfide by Chemical Thermodynamics

运用化学热力学基础理论和方法研究了硫化铋在无氧化性强酸和可溶性碱金属卤化物溶液中的溶解性.结果表明硫化铋只能溶于氢卤酸(除氢氟酸外)、稀硫酸与碱金属卤化物的混合液中,不能溶于稀硫酸中.硫化铋能溶于氢卤酸,主要是溶液酸效应及配位效应同时作用的原因,也就是该溶解过程发生了“复分解——配位”二步反应,而不是硫化铋的碱性所为.

It is studied further that the dissolubility of the bismuthous sulfide in the solutions of the non-oxidative strong acid through the experiment by means of chemical thermodynamics. The experimental results are consistent with reference literature. Which indubitably indicate that the bismuthous sulfide can only dissolve in halogen acid except hydrofluoric acid, the mixed solution of dilute sulfuric acid and alkali halide. Deeded, It cannot dissolve in the dilute sulfuric acid. The dissolution of the bismuthous sulfide in halogen acid arises from the metathesis-coordination reaction instead of the result of its basicity.