以培养研究型人才为导向的基础化学实验教学设计与实践

doi:10.3866/PKU.DXHX202005005

Abstract

Abstract:

From the point of cultivating research talents, the necessity of research teaching mode in the teaching process of basic chemistry experiment is expounded. Taking "sodium thiosulfate solution calibration experiment" as the teaching case, students were guided to actively explore, and comprehensively use the theoretical knowledge and technology. Selecting KIO3 as the basis material, the experimental conditions and end-point judgment methods were investigated from four aspects: acidity, water addition, reaction time and KI solution addition. The design and practice of research-oriented teaching in the process of basic chemistry experiment teaching is helpful to cultivate students' systematic research methods, rigorous scientific thinking, and the scientific literacy to explore and innovate.

Key words: Research-type talents, Basic chemistry experiment, Research-based teaching, Innovative ability

Jing Wang, Huiping Li, Xiaoyan Wang, Shizhong Luo, Shuwen Wang. Design and Practice of Basic Chemistry Experiment Teaching Guided by Training Research Talents[J].University Chemistry, 2021, 36(4): 2005005.

Figures/Tables 6

References 13

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实验编号	m(K₂Cr₂O₇)/g	V(Na₂S₂O₃)/mL	c(Na₂S₂O₃)/(mol·L^-1)	${\bar c}$(Na₂S₂O₃)/(mol·L^-1)
1	0.1250	25.68	0.09928	0.09929
2	0.1309	27.11	0.09848
3	0.1589	32.37	0.1001

H₂SO₄		基准物反应结束时pH	V(Na₂S₂O₃)/mL	c(Na₂S₂O₃)/(mol·L^-1)
c(H₂SO₄)/(mol·L^-1)	V/mL	基准物反应结束时pH	V(Na₂S₂O₃)/mL	c(Na₂S₂O₃)/(mol·L^-1)
3	1	1.32	28.55	0.09829
3	3	0.81	28.30	0.09915
1	1	5.89	24.54	0.1144
	2	1.67	28.50	0.09846
	3	1.35	28.47	0.09856
	4	1.17	28.50	0.09846
	5	1.06	28.60	0.09811
	6	0.99	28.41	0.09877
	7 8 2	0.93 0.84 5.96	28.51	0.09842
	7 8 2	0.93 0.84 5.96	28.49 18.30	0.09849 0.1533
0.5	3	5.15	28.36	0.09894
	4	2.15	28.52	0.09839
	5	1.89	28.51	0.09842
	6	1.64	28.50	0.09846
	7	1.52	28.51	0.09842
0.2	5	5.94	18.76	0.1496
	6	5.54	22.80	0.1231
	7	5.30	26.38	0.1064
	7.5	4.34	28.41	0.09877
	8	2.72	28.42	0.09874
	9	2.50	28.51	0.09842
	10	2.06	28.30	0.09915
	11	1.94	28.27	0.09926

加入0.2 mol·L^-1 H₂SO₄的体积V(H₂SO₄)/mL	加入水的体积V(H₂O)/mL	pH		V(Na₂S₂O₃)/mL	c(Na₂S₂O₃)/mol·L^-1
加入0.2 mol·L^-1 H₂SO₄的体积V(H₂SO₄)/mL	加入水的体积V(H₂O)/mL	基准物反应结束时	加水后	V(Na₂S₂O₃)/mL	c(Na₂S₂O₃)/mol·L^-1
8	0	2.70	2.75	28.10	0.09986
	50	2.69	2.92	28.67	0.09788
	100	2.72	3.04	27.89	0.1006
10	0	2.03	2.10	28.23	0.09940
	50	2.02	2.19	27.95	0.1004
	100	2.06	2.30	28.01	0.1002

0.2 mol·L^-1 H₂SO₄溶液体积V(H₂SO₄)/mL	pH	基准物反应时间t/min	V(Na₂S₂O₃)/mL	c(Na₂S₂O₃)/(mol·L^-1)
7	5.23	0	26.44	0.1061
		1	26.40	0.1063
		3	26.38	0.1064
7.5	4.22	0	28.19	0.09954
		1	28.04	0.1001
		3	28.00	0.1002
		5	28.00	0.1002
8	2.96	0	28.22	0.09943
		1	28.21	0.09947
		3	28.01	0.1002
		5	28.00	0.1002
11	1.95	0	28.20	0.09951
		1	28.09	0.09990
		3	28.02	0.1001
		5	27.94	0.1004

pH	加入10% KI溶液的体积V(KI)/mL	加入10%KI溶液后现象	V(Na₂S₂O₃)/mL	c(Na₂S₂O₃)/mol·L^-1
4	5	浑浊，放置3 min后可见明显棕色沉淀
	8	红棕色澄清溶液	28.10	0.09986
	10		28.13	0.09975
	13		28.28	0.09922
	15		28.03	0.1001
3	5	浑浊，放置3 min后可见明显棕色沉淀
	8	红棕色澄清溶液	28.00	0.1002
	10		28.28	0.09922
	13		28.11	0.09982
	15		28.21	0.09947
2	5	浑浊，放置3 min后可见明显棕色沉淀
	8	红棕色澄清溶液	28.03	0.1001
	10		28.10	0.09986
	13		28.14	0.09972
	15		28.2	0.09951

Design and Practice of Basic Chemistry Experiment Teaching Guided by Training Research Talents

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