酸碱滴定曲线的数学分析及其化学意义的探讨

doi:10.3866/PKU.DXHX202205041

Abstract

Abstract:

Acid-base titration is the most basic experiment in analytical chemistry. The titration curve reflects the whole process of neutralization reaction and is very important to understand acid-base titration. Based on three basic hypotheses, the chemical equilibrium, electroneutrality principle and mass balance, we established mathematical model between ionization degree and pH as well as titration percentage by keeping one parameter unchanged and the other two changed at the initial point. In addition, we recovered the acid-base titration curve by performing mathematical analysis and derivatization of the function. Through the analysis of two initial conditions in mathematical formula and the effects on the function, the quantitative validation on interpretations was introduced for reactions of different concentrations and strength of acids in titrations described in traditional teaching materials. With theoretical expansion of titration curves, we proposed a possible method for weak acid titration.

Key words: Analytical chemistry, Acid-base titration, Titration curve, Acid-base equilibrium, Mathematical model

Xuyang Wang, Shuzhe Sun, Xiaowen Xu, Guizheng Zou, Bin Zhang. Mathematical and Chemical Analyses of Acid-Base Titration Curve[J].University Chemistry, 2023, 38(2): 243-252.

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Mathematical and Chemical Analyses of Acid-Base Titration Curve

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