实验教学中弛豫法测定反应速率常数的研究  

On Determination of Reaction Rate Constant by Relaxation Method in Experimental Teaching

作　　者：蒋益敏 申伟[1] 何荣幸[1] JIANG Yi-min;SHEN Wei;HE Rong-xing(School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China)

机构地区：[1]西南大学化学化工学院,重庆400715

出　　处：《西南师范大学学报（自然科学版）》2021年第5期190-194,共5页Journal of Southwest China Normal University(Natural Science Edition)

基　　金：国家青年科学基金项目(22006120);重庆市自然科学基金面上项目(cstc2020jcyj-msxmX0536).

摘　　要：弛豫法测定反应速率常数是物理化学实验中一个基础性教学实验,针对弛豫法测定铬酸根重铬酸根反应速率常数实验中存在的结果误差大的问题,从pH计的安装方式、扰动液与被扰动液的浓度比、数据的处理方法3个方面对实验进行了探索与改进.改进后的实验可测得较准确的反应速率常数,相对误差小于10%,且实验的可重复性良好,能够更好地用于该实验的教学.Determination of reaction rate constant by relaxation method is a basic teaching experiment in physical chemistry experiments.In order to solve the problem of great experimental errors in the determination of the reaction rate constant for chromium-dichromate system by relaxation method,three aspects including installation mode of pH meter,the concentration ratio of disturbing solution vs.disturbed solution and the method of data processing have been explored and improved.In the improved experiment,accurate reaction rate constant can be achieved and its relative error is reduced to 10%or less.The experiment has a good repeatability,which can be well applied in the experimental teaching for the determination of reaction rate constant by relaxation method.

关 键 词：弛豫法 反应速率常数 测定 实验教学改进 

分 类 号：G642.423[文化科学—高等教育学] O643[文化科学—教育学]