基于经典实验的教学改革模式探讨——以二元液系气液平衡相图实验的改进为例

doi:10.3866/PKU.DXHX202110017

Abstract

Abstract:

From the aspects of experimental device, experimental system, solution preparation, and data measurement, comprehensive exploration of the classical physical chemistry experiment "gas-liquid equilibrium phase diagram of a binary liquid system" was carried out. The consumption of experimental reagents was reduced, the experimental time was shortened, the operability and reproducibility of the experiment was improved, and the potential safety hazards in the experimental process were eliminated. After several years of engineering experiment teaching practice, these improvement measures are shown to enhance students' understanding of the low-carbon environmental protection concept, improve the experimental process experience, and strengthen the innovative effect of classical experiments. By guiding students to deeply understand the basic theory of gas-liquid phase equilibrium, these measures will help cultivate students' innovative thinking and obtain good experimental teaching evaluation.

Key words: Binary liquid system phase diagram, Gas liquid equilibrium, Experimental improvement, Teaching innovation

Hui Xiong, Yinghui Wu, Beina Wu, Fuming Mei, Yuefa Gong. Discussion on Teaching Reform Mode Based on a Classical Experiment: An Example of Experimental Improvement of the Gas-Liquid Equilibrium Phase Diagram with a Binary Liquid System[J].University Chemistry, 2022, 37(2): 2110017.

Figures/Tables 11

References 16

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溶液组成	T/℃	n_g (气相)	n_l (液相)	摩尔分数(x_g)	摩尔分数(x_l)
50.0 mL正丙醇	96.2	1.3833	1.3833	1.0096	1.0096
+ 1.0 mL水	95.7	1.3816	1.3827	0.9779	0.9984
+ 2.0 mL水	90.7	1.3793	1.3815	0.9349	0.9760
+ 4.0 mL水	87.2	1.3767	1.3775	0.8863	0.9013
+ 6.0 mL水	87.4	1.3765	1.3735	0.8826	0.8266
40.0mL水	99.6	1.3332	1.3332	0.0738	0.0738
+ 1.0 mL正丙醇	97.2	1.3612	1.3339	0.5968	0.0869
+ 2.0 mL正丙醇	94.1	1.3740	1.3366	0.8359	0.1373
+ 4.0 mL正丙醇	91.0	1.3755	1.3421	0.8639	0.2400
+ 10.0 mL正丙醇	87.9	1.3768	1.3559	0.8882	0.4978
+ 20.0 mL正丙醇	87.5	1.3767	1.3671	0.8863	0.7070

溶液组成	纯物质的沸点/℃	恒沸点/℃	恒沸点组成(摩尔分数)
水+正丙醇	100.0–97.1	87.7	0.288 (0.712)
乙醇+环己烷	78.5–80.7	64.9	0.445 (0.555)

溶液组成	T/℃	n_g (气相)	n_l (液相)	摩尔分数(x_g)	摩尔分数(x_l)
20.0 mL环已烷	80.8	1.4240	1.4240	1	1
+ 0.5 mL乙醇	70.8	1.4100	1.4195	0.7087	0.8933
+ 1.0 mL乙醇	66.2	1.4015	1.4175	0.5568	0.8531
+ 1.5 mL乙醇	65.2	1.4007	1.4125	0.5432	0.7558
+ 2.0 mL乙醇	65.0	1.4006	1.4055	0.5415	0.6268
+ 4.0 mL乙醇	64.9	1.4002	1.4006	0.5347	0.5415
20.0 mL乙醇	78.3	1.3589	1.3589	0	0
+ 1.5 mL环己烷	73.7	1.3821	1.3630	0.2570	0.0253
+ 2.5 mL环己烷	70.0	1.3914	1.3680	0.3926	0.0799
+ 3.0 mL环己烷	67.7	1.3965	1.3727	0.4733	0.1350
+ 5.0 mL环己烷	66.2	1.3981	1.3790	0.4996	0.2151

溶液组成	T/℃	n_g (气相)	n_l (液相)	摩尔分数(x_g)	摩尔分数(x_l)
20.0 mL环已烷	80.89	1.4247	1.4247	1	1
+ 0.5 mL乙醇	71.83	1.4064	1.4221	0.6429	0.9465
+ 1.0 mL乙醇	66.45	1.4034	1.4174	0.5897	0.8511
+ 1.5 mL乙醇	65.26	1.4026	1.4143	0.5758	0.7903
+ 2.0 mL乙醇	65.01	1.4017	1.4092	0.5603	0.6939
+ 4.0 mL乙醇	64.95	1.4013	1.4008	0.5534	0.5449
20.0 mL乙醇	78.35	1.3587	1.3587	0	0
+ 1.5 mL环己烷	74.83	1.3732	1.3631	0.1412	0.0264
+ 2.5 mL环己烷	70.70	1.3906	1.3669	0.3803	0.0675
+ 3.0 mL环己烷	68.33	1.3951	1.3738	0.4507	0.1486
+ 5.0 mL环己烷	66.58	1.3983	1.3822	0.5029	0.2584

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Discussion on Teaching Reform Mode Based on a Classical Experiment: An Example of Experimental Improvement of the Gas-Liquid Equilibrium Phase Diagram with a Binary Liquid System

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