基于智能手机的丙酮碘化反应改进实验

doi:10.3866/PKU.DXHX202212026

University Chemistry ›› 2023, Vol. 38 ›› Issue (4): 7-12.doi: 10.3866/PKU.DXHX202212026

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Improved Experiment for Iodination of Acetone Based on Smartphone Reactor

Yue Zhang, Haiying Yu, Junsheng Hao(), Yue Jiang, Ziwei Wang, Bing Huang

National Demonstration Center for Experimental Chemistry Education, School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China

Received:2022-12-08 Accepted:2023-01-04 Published:2023-03-27
Contact: Junsheng Hao E-mail:jshao@sxu.edu.cn

Abstract

Abstract:

In the traditional "acetone iodination" experiment, there are problems such as corrosion, irritation caused by HCl volatilization, and inconsistent temperature or time between the spectrophotometric test and the actual reaction process. These problems are inevitably encountered and have not been effectively addressed. With a focus on these problems, the improved experiment presented a colorimetric analysis system based on a smartphone and new glass reactor; the test method was also proposed. The improved experiment avoids instrument corrosion, human body stimulation caused by HCl, improves the accuracy of the experimental data, and is helpful for students to gain theoretical and experimental expertise on the Lambert-Beer law and its offset phenomenon. In addition, since a spectrophotometer is not required, the improved experiment is easier to popularize and more interesting. It also provides a new strategy for online experimental teaching under difficult conditions such as the epidemic.

Key words: Acetone iodination, Smartphone, Colorimetry

Yue Zhang, Haiying Yu, Junsheng Hao, Yue Jiang, Ziwei Wang, Bing Huang. Improved Experiment for Iodination of Acetone Based on Smartphone Reactor[J].University Chemistry, 2023, 38(4): 7-12.

反应体系序号	HCl溶液(mL)	碘溶液(mL)	丙酮溶液(mL)	反应体系序号	HCl溶液(mL)	碘溶液(mL)	丙酮溶液(mL)
1	5.00	5.00	5.00	5	5.00	5.00	4.00
2	4.00	5.00	5.00	6	5.00	5.00	6.00
3	6.00	5.00	5.00	7	5.00	5.00	7.00
4	7.00	5.00	5.00

温度	C_碘 × 10⁻³ (mol･L⁻¹)	碘溶液图像	R	G	B	G_n
30 ℃	1.600		231.735	69.876	16.245	0.220
	1.400		234.777	87.151	14.622	0.259
	1.200		240.989	100.451	11.434	0.285
	1.100		236.377	110.058	2.620	0.315
	0.800		240.917	127.720	1.630	0.345
	0.600		233.101	141.408	1.147	0.376
	0.500		231.066	151.543	1.338	0.395
	0.400		226.521	159.195	4.105	0.408
	0.200		224.618	189.221	95.158	0.372
拟合结果		G_n = −154.488 × C_碘 + 0.470 R² = 0.9987
35 ℃	1.600		239.093	72.605	14.862	0.222
	1.400		241.668	85.028	14.037	0.250
	1.200		247.559	98.257	12.857	0.274
	1.100		251.605	123.512	12.884	0.318
	0.800		253.560	144.534	13.048	0.352
	0.600		254.816	170.479	13.144	0.389
	0.500		254.680	180.722	12.428	0.404
	0.400		254.426	195.313	16.626	0.419
	0.200		250.208	219.079	132.278	0.364
拟合结果		G_n = −169.344 × C_碘 + 0.487 R² = 0.9961

温度	反应体系序号	反应速率(mol∙L∙s⁻¹)	分级数x，y	反应速率常数(L∙mol⁻¹∙s⁻¹)
30 ℃	1	2.08 × 10⁻⁶	x = 1.05 ≈ 1 y = 1.01 ≈ 1	5.17 × 10⁻⁵
	2	1.59 × 10⁻⁶
	3	2.43 × 10⁻⁶
	4	3.00 × 10⁻⁶
	5	1.51 × 10⁻⁶
	6	2.36 × 10⁻⁶
	7	2.96 × 10⁻⁶
35 ℃	1	3.54 × 10⁻⁶	x = 1.01 ≈ 1 y = 1.00 ≈ 1	8.93 × 10⁻⁵
	2	2.85 × 10⁻⁶
	3	4.20 × 10⁻⁶
	4	5.30 × 10⁻⁶
	5	2.89 × 10⁻⁶
	6	4.41 × 10⁻⁶
	7	5.40 × 10⁻⁶

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Improved Experiment for Iodination of Acetone Based on Smartphone Reactor

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