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Citation: Tiejun Su. The Construction and Application of the Calculation Formula for Endpoint Error in Precipitation Titration: A Case Study of the Mohr Method[J]. University Chemistry, ;2024, 39(11): 384-387. doi: 10.12461/PKU.DXHX202402039 shu

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

Tiejun Su ^1,2

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 Date: 20 February 2024
Revised Date: 6 May 2024

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.
- Precipitation titration,
- Endpoint error,
- Titration jump,
- Indicator
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