引用本文:
魏海英, 杨大清, 闰明涛, 霍国燕. 实验设计的合理性考察与探析——以高锰酸钾和溴化钾的反应为例[J]. 大学化学,
2024, 39(10): 283-288.
doi:
10.12461/PKU.DXHX202404068
Citation: Haiying Wei, Daqing Yang, Mingtao Run, Guoyan Huo. Examination and Analysis on Rationality of Experimental Design: Based on Reaction of Potassium Permanganate with Potassium Bormide[J]. University Chemistry, 2024, 39(10): 283-288. doi: 10.12461/PKU.DXHX202404068
Citation: Haiying Wei, Daqing Yang, Mingtao Run, Guoyan Huo. Examination and Analysis on Rationality of Experimental Design: Based on Reaction of Potassium Permanganate with Potassium Bormide[J]. University Chemistry, 2024, 39(10): 283-288. doi: 10.12461/PKU.DXHX202404068
实验设计的合理性考察与探析——以高锰酸钾和溴化钾的反应为例
English
Examination and Analysis on Rationality of Experimental Design: Based on Reaction of Potassium Permanganate with Potassium Bormide
Abstract:
A well-designed experiment allows students to better understand chemical principles through observable phenomena. This study investigates the reaction between potassium permanganate and potassium bromide under two different conditions: identical setups as found in standard textbooks and varying pH ranges. The results indicate that potassium bromide reduces potassium permanganate in two distinct steps in the pH range 1.95–0.98, with the reduction products being influenced by the pH of the solution. The critical pH for the spontaneous occurrence of the second step is 1.21, which is close to the theoretical value of 1.36. Based on these findings, two recommendations are provided to further refine the experimental design by verifying the impact of acidity on reaction rates.
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Key words:
- Redox reaction
- / Potassium permanganate
- / Potassium bromide
- / Stepwise reduction
- / Acidity
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