大学化学 >> 2021, Vol. 36 >> Issue (9): 2103015.doi: 10.3866/PKU.DXHX202103015

所属专题： 分析化学课程与实验教学

师生笔谈 上一篇    下一篇

全面认识酸碱缓冲溶液的缓冲能力——由高校通用教材中一道例题引发的思考

岳宣峰1, 段亚娟1, 孙君岳1, 简亚军1, 张延妮2,*()   

  1. 1 陕西师范大学化学化工学院, 陕西省生命分析化学重点实验室, 西安 710062
    2 陕西师范大学药用资源与天然药物化学教育部重点实验室, 西安 710062
  • 收稿日期:2021-03-08 录用日期:2021-04-07 发布日期:2021-05-06
  • 通讯作者: 张延妮 E-mail:ynzhang@snnu.edu.cn
  • 作者简介:张延妮, Email: ynzhang@snnu.edu.cn
  • 基金资助:
    陕西师范大学研究生教育教学改革研究项目(GERP-19-60);陕西师范大学研究生教育教学改革研究项目(GERP-20-18)

Comprehensive Understanding of Buffer Function of Buffer Solution: Inspired by an Example in a Textbook

Xuanfeng Yue1, Yajuan Duan1, Junyue Sun1, Yajun Jian1, Yanni Zhang2,*()   

  1. 1 Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, China
    2 Key Laboratory of the Ministry of Education for Medicinal Resources and Natural Pharmaceutical Chemistry, Shaanxi Normal University, Xi'an 710062, China
  • Received:2021-03-08 Accepted:2021-04-07 Published:2021-05-06
  • Contact: Yanni Zhang E-mail:ynzhang@snnu.edu.cn

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摘要：

区分了有关缓冲溶液的两个指标，分别用来衡量瞬态缓冲能力和持续缓冲能力，提议分别命名为缓冲强度β和缓冲容量α（对应的计算公式分别是微分式和积分式），对教材中采用微分式进行有关持续缓冲能力计算的可行性进行了深入探讨，指出了其适用条件，并由此就教材相关内容提出改进建议。

关键词: 缓冲能力, 缓冲指数, 缓冲容量, pH

Abstract:

Two indices addressing buffer solution are differentiated, which are used to gauge punctual and durative buffer function, respectively. Buffer strength β and buffer capacity α are accordingly suggested for the names of the indices (their corresponding mathematic expressions are differential formula and integral formula, respectively). The feasibility of introducing differential formula into calculation of durative capacity in the textbooks is intensively discussed, and the applicable conditions of this practice are pointed out, which forms the basis of suggestions for improvement on some contents of the textbooks.

Key words: Buffer function, Buffer strength, Buffer capacity, pH