大学化学 >> 2020, Vol. 35 >> Issue (6): 54-62.doi: 10.3866/PKU.DXHX202002001

所属专题： 大学生实践活动

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智能手机色度分析测定甲基紫与氢氧化钠反应速率常数

曾一帆, 秦萧, 王玥, 黎朝()   

  • 收稿日期:2020-02-02 录用日期:2020-04-01 发布日期:2020-04-28
  • 通讯作者: 黎朝 E-mail:lizhao@xmu.edu.cn
  • 基金资助:
    国家基础科学人才培养基金项目(J1310024)

Determination of Kinetic Constant of Methyl Violet with Sodium Hydroxide Using Smart Phone

Yifan Zeng, Xiao Qin, Yue Wang, Zhao Li()   

  • Received:2020-02-02 Accepted:2020-04-01 Published:2020-04-28
  • Contact: Zhao Li E-mail:lizhao@xmu.edu.cn

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摘要：

化学反应速率是反应动力学最基本的一个概念，化学反应速率常数的测定是基础化学实验中的必做实验。但该实验存在着试剂消耗量大等诸多缺点。本次实践活动从绿色化学理念出发，提出了通过将色彩理论与化学知识结合进行反应速率的测定，以达到节省实验所用试剂、提高学生对实验的兴趣等目的。首先调研了解学生对经典动力学实验的看法和利用智能手机进行化学实验的接受度，并在理论上对该方法的可行性进行了分析，再根据录制的甲基紫与NaOH反应的视频，通过色度分析获得了浓度随时间变化的曲线，由此测定了该反应的反应速率常数。该方法结合了互补光色理论、物质吸光定律等知识，只需利用智能手机和取色软件就可以开展动力学实验。

关键词: 反应速率常数, 色度分析, 绿色化学, 实践调研

Abstract:

The chemical reaction rate is the basic concept of reaction kinetics, and chemical kinetic experiments to determine rate laws are common in college chemistry laboratory courses. However, there are many shortcomings in this experiment, with the large consumption of reagents as one of them. Starting from the concept of green chemistry, we propose to combine the color theory with chemical knowledge, so as to save the reagents used in the experiment and improve the students' interest in the experiment. In this paper, we first conducted a survey to investigate the subjective evaluation on classical kinetics experiments and the willingness to do virtual chemical experiments with smart phones. After analyzing the feasibility of the method in theory, we shot a short video of the reaction of methyl violet with sodium hydroxide, and determination of the kinetic constant using colorimetric analysis. The method combines the complementary color theory and Lamber-Beer law, and a dynamic experiment can be carried out by using smart phone and commonly used software only.

Key words: Kinetic constant, Colorimetric analysis, Green chemistry, Practice research