沉淀滴定终点误差的计算公式及应用——以莫尔法为例  

The Construction and Application of the Calculation Formula for Endpoint Error in Precipitation Titration:A Case Study of the Mohr Method

作　　者：苏铁军 Tiejun Su(College of Medicine and Health Science,Jingzhou University,Jingzhou 434020,Hubei Province,China;Virtual Teaching and Research Section of Analytical Chemistry Course,Ministry of Education,Changsha 410082,China)

机构地区：[1]荆州学院健康医学院,湖北荆州434020 [2]教育部分析化学课程虚拟教研室,长沙410082

出　　处：《大学化学》2024年第11期384-387,共4页University Chemistry

基　　金：荆州学院一流本科课程建设项目;湖北省高等学校省级教学研究项目(2021532)。

摘　　要：终点误差是分析化学中的重要教学内容。基于沉淀溶解平衡理论和终点误差定义,推导出了计算莫尔法终点误差的一般公式。介绍了该公式在直接计算终点误差、确定滴定突跃范围及确定指示剂的最低需要量等方面的应用,所得计算结果均与文献值相符。该公式的构建进一步完善了计算终点误差的新方法体系,将有力推动分析化学一流课程的建设。Endpoint error is an important topic in analytical chemistry education.Based on the theory of precipitationdissolution equilibrium and the definition of endpoint error,a general formula for calculating the endpoint error in the Mohr method has been derived.The application of this formula in directly calculating the endpoint error,determining the titration jump range,and determining the minimum required amount of indicator is introduced,and the calculated results are consistent with the literature values.The construction of this formula further improves the new methodological system for calculating endpoint errors,which will effectively promote the development of first-class courses in analytical chemistry.

关 键 词：沉淀滴定 终点误差 滴定突跃 指示剂 

分 类 号：G64[文化科学—高等教育学] O6[文化科学—教育学]