B-Z振荡反应教学实验的反应条件改进  

Improvement of the Reaction Conditions about B-Z Chemical Oscillating Experiment

作　　者：胡佳欣 邹倩 杨文静[1] 王雄英[1] 郭江娜 HU Jiaxing;ZOU Qian;YANG Wenjing;WANG Xiongying;GUO Jiangna(School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China)

机构地区：[1]重庆大学化学化工学院,重庆401331

出　　处：《实验室研究与探索》2019年第3期51-55,202,共6页Research and Exploration In Laboratory

基　　金：第九届重庆大学SRTP项目(CQU-SRTP-2017380)

摘　　要：针对重庆大学出版社出版的《现代基础化学实验》中,采用H2SO4-KBrO3-丙二酸作为反应体系的B-Z振荡反应中存在实验效果不明显,诱导时间较长,振荡信号不够强等弊端,通过考察反应物浓度和催化剂浓度对振荡反应的诱导期、振荡周期和电动势的影响,优化了B-Z振荡反应实验教学体系,提高了实验教学效果。实验结果表明,B-Z振荡反应的最佳实验条件为KBrO3浓度0. 40 mol/L,CH2(COOH)2浓度0. 70 mol/L,H2SO4浓度2. 00 mol/L,催化剂Ce4+浓度6. 00 mmol/L。与《现代基础化学实验》中采用的0. 25 mol/L KBrO3、0. 50 mol/L CH2(COOH)2、3. 00 mol/L H2SO4、4. 00 mmol/L催化剂Ce4+体系的实验结果相比,电动势峰值升高21. 51%,诱导时间减少26. 27%,振荡周期减小27. 27%,实验效果更明显。The book of Experiments of Modern Fundamental Chemistry published by Chongqing University Press gives the conditions of B-Z oscillating reaction experiment by using H2SO4-KBrO3-malonic acid, however, the results are not reasonable: the oscillating signal is not strong and obvious, and the reduce time is quite long. Hence a optimal and improving experimental conditions are presented in this paper. Research results show that the best experimental conditions of concentration of B-Z oscillatory reaction are 0.40 mol/L of KBrO3, 0.70 mol/L of CH2 (COOH) 2, 2.00 mol/L of H2SO4 and 6.00 mmol/L of Ce^4+. The conditions given in the textbook are 0.25 mol/L KBrO3, 0.50 mol/L CH2(COOH)2, 3.00 mol/L H2SO4 and 4.00 mmol/LCe^4+. By the new conditions, the peak of electromotive force increases by 21.51%, the induction time decreases by 26.27%, the oscillation period decreases by 27.27%, and the teaching effect is obvious.

关 键 词：B-Z振荡反应 教学实验 物理化学实验 基础化学实验 

分 类 号：O643[理学—物理化学]