University Chemistry ›› 2024, Vol. 39 ›› Issue (11): 365-373.doi: 10.3866/PKU.DXHX202401086

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A Unified Equation Derived from the Charge Balance Equation for Constructing Acid-Base Titration Curve and Calculating Endpoint Error

Limin Shao1, Na Li2   

  1. 1 School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China;
    2 College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
  • Received:2024-01-30 Accepted:2024-03-12 Published:2024-04-12
  • Contact: Na Li E-mail:lina@pku.edu.cn

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Abstract: Starting from the Charge Balance Equation (CBE), this paper derives the inverse function V= g([H+]) for the titration curve, and directly employs this inverse function to calculate the endpoint error. Based on the characteristics of the CBE formula, the CBE forms of all acid-base systems are unified, and the straightforward correlation between the titration curve and the endpoint error provides learners with a new perspective to understand the connotation of acid-base equilibrium.

Key words: Charge balance equation, Inverse function, Acid-base equilibrium, Acid-base titration curve, Titration error