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由下述反应形成三元配合物体系其配合物稳定常数的测定比较困难,这是因为形成反应与分解反应紧密相连,有时甚至重叠。本文以汞(Ⅱ)-甲基百里酚蓝-X(SCN~-,Be~-,I~-)为例,探讨了两个方法:其-为改变实验设计,然后用经典的离解度法求得稳定常数,方法简便,适于分解反应较弱的情况;其二为先求得分解反应的平衡常数,而后计算前一式的稳定常数,此法不论分解反应强或弱均可使用,但推算较繁。
The ternary complex system formed by the following reaction is more difficult to determine the stability constant of the complex because the formation reaction is closely linked with the decomposition reaction and sometimes even overlaps. In this paper, two methods are discussed, taking mercury (Ⅱ) -methylthymol blue-X (SCN ~ -, Be ~ -, I ~) as an example. The method is to change the experimental design and then use the classical dissociation degree Method is stable, the method is simple, suitable for decomposing the reaction is weak; the second is to find the equilibrium constant of the decomposition reaction, and then calculate the stability of the former constant, this method regardless of the decomposition reaction can be used strong or weak, But projections more complicated.