PH电位法测Cu^(2+)——en配合物的稳定常数

PH Electric Potential Method Measures The Cu^(2+)-en Stability Constant

配合物体系中弱酸性或弱碱性的配位体浓度变化引起体系平衡的改变,也会引起溶液体系PH值的变化,通过测定过程中PH值的变化,可以求出配合物的稳定常数。本文以铜-乙二胺体系为例,利用电位法分别测定乙二胺的变化所引起PH值的变化,以及加入碱所引起体系PH值的变化,得到了配合物的稳定常数,经与文献值对照认为用碱作滴定剂的方法更直观实用。

The concentration changes which is of weak acidic or weak basic complex in complex the system balance change, and the PH of solution system. Through measuring the PH change,we system can cause can conclude the stability constants of Complex. This paper measures the changes of PH as the change of quantities of ethylene diamine and the addition of base in copper - ethylene diamine system. Compared with the documents numeral values, the methods prove to be simple and practical.