酸碱滴定中强碱滴定弱酸滴定初始曲线的数学解释——以NaOH滴定HAc为例

doi:10.3866/PKU.DXHX202008008

University Chemistry ›› 2021, Vol. 36 ›› Issue (6): 2008008.doi: 10.3866/PKU.DXHX202008008

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Mathematical Interpretation of Initial Curve of Acid-Base Titration between Strong Base and Weak Acid: Taking NaOH and HAc as an Example

Shuzhe Sun¹^,², Zehao Zhang²^,³, Bin Zhang¹^,*()

¹ School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
² Taishan College, Shandong University, Jinan 250100, China
³ School of Life Sciences, Shandong University, Qingdao 266237, Shandong Province, China

Received:2020-08-03 Accepted:2020-08-11 Published:2020-09-10
Contact: Bin Zhang E-mail:binzhang68@sdu.edu.cn

Abstract

Abstract:

In the acid-base titration curve of titration from NaOH to HAc, shown in the sixth edition of Analytical Chemistry edited by Wuhan University, we found that there was an obvious protruding part of the curve at the initial stage of titration, which was significantly different from the curve of titration from NaOH to HCl at the same concentration. In this paper, the mathematical expression of fitting the curve is derived by using various equilibrium relations in acid-base reaction. The correlation law of acid-base titration is proved by combining with the image of mathematical function. The mathematical model can explain not only the differences between two curves, but also the reasons and influencing factors of the initial titration curve difference of weak acids by strong alkali titration.

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

MSC2000:

Shuzhe Sun, Zehao Zhang, Bin Zhang. Mathematical Interpretation of Initial Curve of Acid-Base Titration between Strong Base and Weak Acid: Taking NaOH and HAc as an Example[J].University Chemistry, 2021, 36(6): 2008008.

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Mathematical Interpretation of Initial Curve of Acid-Base Titration between Strong Base and Weak Acid: Taking NaOH and HAc as an Example

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