酸碱滴定中影响终点误差诸因素的实验研究

Experimental study on the factors affecting the endpoint error in an acid-base titration

本文从常用的酸碱指示剂的吸收光谱与p H值的关系,以及被滴定对象的酸碱性质入手,用实验的方式研究了强碱滴定强酸、强碱滴定一元弱酸、强碱滴定多元弱酸等多个体系在滴定过程中p H值的变化情况,分析探讨了影响终点误差的诸多因素,这为提高酸碱滴定法的准确度,以及加深对理论课教学中的难点内容——终点误差部分的理解很有帮助。

From the relationship between the absorption spectra of the common acid-base indicator and pH, as well as the acid-base properties of object by titration, it was studied by an experimental way for pH changes of multiple systems such as strong acid, monoprotic weak acid and polyprotic acids in acid base titration. And it was analysised and discussed that the factors influence on the endpoint error. This is very helpful for improving the ac- curacy of acid-base titration, and in-depth understanding of the part of endpoint error, which is the difficult con- tent in the teaching of theory of analytical chemistry.