University Chemistry ›› 2021, Vol. 36 ›› Issue (9): 2103015.doi: 10.3866/PKU.DXHX202103015

Special Issue: 分析化学课程与实验教学

• Between Teacher and Student • Previous Articles     Next Articles

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


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


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