大学化学 >> 2025, Vol. 40 >> Issue (7): 328-335.doi: 10.12461/PKU.DXHX202409062

化学实验 上一篇    下一篇

基于手机APP判断酸碱反应滴定终点的可视化分析

厉文辉, 朱昶硕, 崔欣宇, 赵晨飞, 邱丽娜, 李燕, 吴传东, 杨敏, 庄媛   

  1. 北京科技大学化学与生物工程学院化学与化学工程系, 北京 100083
  • 收稿日期:2024-09-12 录用日期:2024-12-09 发布日期:2025-07-01
  • 通讯作者: 厉文辉 E-mail:liwh@ustb.edu.cn
  • 基金资助:
    北京科技大学“课程思政特色示范课程”建设项目(KC2023SZ29)；北京科技大学2023年度研究生教材建设重点项目(2024JCA023)；北京科技大学全英文教学示范课程建设项目(KC2022QYW09)；北京科技大学2024年度国际学生教材专项建设项目(JC2024YBGJXS007)；北京科技大学重大教改项目《思想强基，创新铸魂--基础学科拔尖人才培养探索》 (JG2023ZD05)

Visual Determination of Acid-Base Titration Endpoints Using Smartphone APP-Based Analysis

Wenhui Li, Changshuo Zhu, Xinyu Cui, Chenfei Zhao, Lina Qiu, Yan Li, Chuandong Wu, Min Yang, Yuan Zhuang   

  1. Department of Chemistry and Chemical Engineering, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2024-09-12 Accepted:2024-12-09 Published:2025-07-01
  • Contact: Wenhui Li E-mail:liwh@ustb.edu.cn

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摘要： 本实验创新性地将RGB (Red红，Green绿，Blue蓝)检测方法应用于分析化学教学实验中，通过自主开发的Color Picker软件，记录滴定反应进程中溶液颜色RGB值的变化，建立了以溶液中G/(R+G+B)二阶微分值变化判断滴定终点的分析方法。将该方法应用于“无水碳酸钠标定盐酸溶液”实验中，终点误差均在0.1%以内，三次平行实验相对标准偏差为0.084%。该方法与目视滴定法相比，具有较高的准确度和重现性，也为色弱、色盲等色觉异常患者提供了参与化学实验的机会。本实验不仅有助于培养学生严谨的科学态度，更能有效激发学生的创新思维、提高学生的创新能力，使学生在实践中深刻体验化学实验的魅力。

关键词: 酸碱滴定, 可视化, RGB值检测, 二阶微分值, 终点误差

Abstract: This study innovatively applies the RGB (Red, Green, Blue) detection method to analytical chemistry teaching experiments. Utilizing our self-developed Color Picker software to monitor RGB value variations during the titration process, we established an analytical approach for endpoint determination based on second-order differential changes in the G/(R+G+B) ratio. When implemented in the “Standardization of Hydrochloric Acid Solution with Anhydrous Sodium Carbonate” experiment, the method demonstrated endpoint errors below 0.1%, with a relative standard deviation of 0.084% across triplicate measurements. Compared with conventional visual titration, this technique exhibits superior accuracy and reproducibility while providing accessibility for color vision-deficient students. The experiment not only fosters students’ rigorous scientific approach but also stimulates innovative thinking, enhancing their practical understanding of chemical experimentation.

Key words: Acid-base titration, Visualization, RGB detection, Second-order differential values, Endpoint error