大学化学 >> 2024, Vol. 39 >> Issue (11): 384-387.doi: 10.12461/PKU.DXHX202402039

师生笔谈 上一篇    下一篇

沉淀滴定终点误差的计算公式及应用——以莫尔法为例

苏铁军1,2   

  1. 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
  • 收稿日期:2024-02-20 录用日期:2024-05-06 发布日期:2024-11-09
  • 通讯作者: 苏铁军 E-mail:sutj06@sina.com
  • 基金资助:
    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)

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

Tiejun Su1,2   

  1. 1 College of Medicine and Health Science, Jingzhou University, Jingzhou 434020, Hubei Province, China;
    2 Virtual Teaching and Research Section of Analytical Chemistry Course, Ministry of Education, Changsha 410082, China
  • Received:2024-02-20 Accepted:2024-05-06 Published:2024-11-09
  • Contact: Tiejun Su E-mail:sutj06@sina.com

PDF

532

赞

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。

关键词: 沉淀滴定, 终点误差, 滴定突跃, 指示剂

Abstract: Endpoint error is an important topic in analytical chemistry education. Based on the theory of precipitation-dissolution 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.

Key words: Precipitation titration, Endpoint error, Titration jump, Indicator