大学化学 >> 2024, Vol. 39 >> Issue (3): 390-394.doi: 10.3866/PKU.DXHX202309030

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分析化学教学中引入动态缓冲容量“去公式化”计算的新策略

张红医1,2,*(), 石志红1,2, 张志军3   

  1. 1 河北大学化学与材料科学学院, 河北 保定 071002
    2 河北大学化学教学研究所, 河北 保定 071002
    3 沧州旭阳化工有限公司, 河北 沧州 061113
  • 收稿日期:2023-09-07 录用日期:2023-09-20 发布日期:2023-09-27
  • 通讯作者: 张红医 E-mail:hyzhang@hbu.edu.cn
  • 基金资助:
    2021年河北省课程思政示范课程;材料化学国家一流专业(YS23-YLZY-021);河北省研究生教育教学改革研究项目(YJG2023005);河北省研究生教育教学改革研究项目(YJG2023003)

A New Strategy for "De-formulized" Calculation of Dynamic Buffer Capacity in Analytical Chemistry Education

Hongyi Zhang1,2,*(), Zhihong Shi1,2, Zhijun Zhang3   

  1. 1 College of Chemistry and Materials Science, Hebei University, Baoding 071002, Hebei Province, China
    2 Teaching Institute for Chemistry, Hebei University, Baoding 071002, Hebei Province, China
    3 Cangzhou Risun Chemicals Co., Ltd., Cangzhou 061113, Hebei Province, China
  • Received:2023-09-07 Accepted:2023-09-20 Published:2023-09-27
  • Contact: Hongyi Zhang E-mail:hyzhang@hbu.edu.cn

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摘要：

缓冲容量是分析化学重要内容。目前教材中缓冲容量计算没有考虑缓冲溶液与样品溶液混合时体积的变化，这种不考虑体积变化的缓冲容量被称为“静态”缓冲容量。而在实际应用中，往往缓冲溶液与样品溶液混合后的体积远远大于缓冲溶液的原始体积，此时需要考虑“动态”缓冲溶液。这里提出了一种“动态”缓冲容量问题的“去公式化”解决方案，它完全基于学科思想的底层逻辑，不会增加学生学习的记忆负担。

关键词: 静态缓冲容量, 动态缓冲容量, 去公式化, GeoGebra软件

Abstract:

Buffer capacity is an important concept in analytical chemistry. Conventional calculations often neglect volume changes that occurs when a buffer solution mixes with a sample solution, yielding what is termed "static" buffer capacity. In practical applications, however, the volume of the buffer solution mixed with the sample solution is often substantially greater than the original volume of the buffer solution, therefore necessitating the consideration of "dynamic" buffer capacity in textbook. This paper proposes a "de-formulized" strategy for addressing "dynamic" buffer capacity problem, which is completely based on the underlying logic of the discipline. This approach avoids adding to the memorization burden of students' learning.

Key words: Static buffer capacity, Dynamic buffer capacity, Calculation by de-formulized mode, GeoGebra software