通过拓展大学化学实验培养学生探索创新能力——以“硫酸铜中铜含量测定(碘量法)”为例

doi:10.3866/PKU.DXHX201909031

Abstract

Abstract:

In one of the experiments of university chemistry laboratory, which is "determination of copper content in copper sulfate (iodometry)", the effect of adding KSCN and the time of adding it were explored at different concentrations of copper sulfate. Results showed that the content of copper was not affected when KSCN was added near the end point or after the introduction of starch, while the content of copper was significantly lower when KSCN was not added or added after KI. This research can be applied in the undergraduate laboratory teaching activity. Under these circumstances, students are divided into different groups according to experimental conditions. Students are guided to compare, analyze and discuss the experimental results. In such a way, students' exploration and innovation spirits are inspired and the teaching effect is improved compared with the traditional book-oriented teaching method.

Key words: Determination of copper content, Iodometry, KSCN, Cultivation of innovative ability

MSC2000:

Ruiqing Sun, Ziting Xu, Qiaohua Wei. Developing Students' Exploration and Innovation Ability through Expanding University Chemistry Laboratory: Taking "Determination of Copper Content in Copper Sulfate (Iodometry)" as an Example[J].University Chemistry, 2020, 35(9): 96-102.

Figures/Tables 10

References 9

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${c_{{\rm{CuS}}{{\rm{O}}_{\rm{4}}}}}$/(mol·L^?1)	次数	${m_{{{\rm{K}}_{\rm{2}}}{\rm{C}}{{\rm{r}}_{\rm{2}}}{{\rm{O}}_{\rm{7}}}}}$/g	${V_{{{\rm{K}}_{\rm{2}}}{\rm{C}}{{\rm{r}}_{\rm{2}}}{{\rm{O}}_{\rm{7}}}}}$/mL	${V_{{\rm{N}}{{\rm{a}}_{\rm{2}}}{{\rm{S}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}}}$/mL	${c_{{\rm{N}}{{\rm{a}}_{\rm{2}}}{{\rm{S}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}}}$/(mol·L^?1)	${c_{{\rm{N}}{{\rm{a}}_{\rm{2}}}{{\rm{S}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}}}$/(mol·L^?1) ^*	RAD/%
0.025	1	0.3422	25	25.78	0.02707	0.02707	0.07%
	2		25	25.8	0.02705
	3		25	25.75	0.0271
0.05	1	0.6133	25	23.72	0.05273	0.05276	0.04%
	2		25	23.7	0.05278
	3		25	23.7	0.05278
0.1	1	1.1805	25	23.5	0.1024	0.1024	0.00%
	2		25	23.5	0.1024
	3		25	23.5	0.1024

${c_{{\rm{CuS}}{{\rm{O}}_{\rm{4}}}}}$/(mol·L^?1)	次数	${c_{{\rm{N}}{{\rm{a}}_{\rm{2}}}{{\rm{S}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}}}$/(mol·L^?1) ^*	${V_{{\rm{KI}}}}$/mL	${V_{{\rm{N}}{{\rm{a}}_{\rm{2}}}{{\rm{S}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}}}$/mL ^**	${V_{{\rm{KSCN}}}}$/mL	${V_{{\rm{N}}{{\rm{a}}_{\rm{2}}}{{\rm{S}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}}}$/mL	${\rho _{{\rm{Cu}}}}$/(g·L^?1)	${\rho _{{\rm{Cu}}}}$/(g·L^?1) ^*	RAD/%
0.025	1	0.02707	4	19.50	2.5	22.75	1.565	1.568	0.10
	2	0.02707	4	20.00	2.5	22.80	1.569
	3	0.02707	4	19.80	2.5	22.80	1.569
0.05	1	0.05276	8	22.50	5	23.88	3.203	3.200	0.06
	2	0.05276	8	22.00	5	23.85	3.199
	3	0.05276	8	22.60	5	23.85	3.199
0.1	1	0.1024	8	19.00	10	20.25	5.271	5.268	0.07
	2	0.1024	8	19.00	10	20.25	5.271
	3	0.1024	8	19.00	10	20.22	5.263

c_CuSO₄/(mol∙L⁻¹)	次数	c_{Na₂S₂O₃}/(mol∙L⁻¹) ^*	V_KI/mL	V_{Na₂S₂O₃}/mL**	V_KSCN/mL	V_{Na₂S₂O₃}/mL	ρ_Cu/(g∙L⁻¹)	ρ_Cu/(g∙L⁻¹) ^*	RAD/%
0.025	1	0.02707	4	20.00	2.5	22.80	1.569	1.568	0.10
	2	0.02707	4	20.00	2.5	22.80	1.569
	3	0.02707	4	20.00	2.5	22.75	1.565
0.05	1	0.05276	8	22.50	5	23.85	3.199	3.196	0.06
	2	0.05276	8	22.50	5	23.82	3.195
	3	0.05276	8	22.50	5	23.82	3.195
0.1	1	0.1024	8	19.00	10	20.20	5.258	5.267	0.11
	2	0.1024	8	19.00	10	20.25	5.271
	3	0.1024	8	19.00	10	20.25	5.271

${c_{{\rm{CuS}}{{\rm{O}}_{\rm{4}}}}}$/(mol·L^?1)	次数	${c_{{\rm{N}}{{\rm{a}}_{\rm{2}}}{{\rm{S}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}}}$/(mol·L^?1) ^*	${V_{{\rm{KI}}}}$/mL	${V_{{\rm{KSCN}}}}$/mL	${V_{{\rm{N}}{{\rm{a}}_{\rm{2}}}{{\rm{S}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}}}$/mL	${\rho _{{\rm{Cu}}}}$/(g·L^?1)	${\rho _{{\rm{Cu}}}}$/(g·L^?1) ^*	RAD/%
0.025	1	0.02707	4	2.5	22.70	1.562	1.561	0.06%
	2	0.02707	4	2.5	22.67	1.560
	3	0.02707	4	2.5	22.70	1.562
0.05	1	0.05276	8	5	23.70	3.179	3.183	0.08%
	2	0.05276	8	5	23.75	3.185
	3	0.05276	8	5	23.75	3.185
0.1	1	0.1024	8	10	20.20	5.258	5.258	0.00%
	2	0.1024	8	10	20.20	5.258
	3	0.1024	8	10	20.20	5.258

${c_{{\rm{CuS}}{{\rm{O}}_{\rm{4}}}}}$/(mol·L^?1)	次数	${c_{{\rm{N}}{{\rm{a}}_{\rm{2}}}{{\rm{S}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}}}$/(mol·L^?1) ^*	${V_{{\rm{KI}}}}$/mL	${V_{{\rm{N}}{{\rm{a}}_{\rm{2}}}{{\rm{S}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}}}$/mL ^**	${V_{{\rm{N}}{{\rm{a}}_{\rm{2}}}{{\rm{S}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}}}$/mL	${\rho _{{\rm{Cu}}}}$/(g·L^?1)	${\rho _{{\rm{Cu}}}}$/(g·L^?1) ^*	RAD/%
0.025	1	0.02707	4	20.00	22.50	1.548	1.549	0.11
	2	0.02707	4	20.00	22.55	1.552
	3	0.02707	4	20.00	22.50	1.548
0.05	1	0.05276	8	22.50	23.75	3.185	3.187	0.10
	2	0.05276	8	22.50	23.80	3.192
	3	0.05276	8	22.50	23.75	3.185
0.1	1	0.1024	8	19.00	20.20	5.258	5.258	0.00
	2	0.1024	8	19.60	20.20	5.258
	3	0.1024	8	19.00	20.20	5.258

Developing Students' Exploration and Innovation Ability through Expanding University Chemistry Laboratory: Taking "Determination of Copper Content in Copper Sulfate (Iodometry)" as an Example

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${c_{{\rm{CuS}}{{\rm{O}}_{\rm{4}}}}}$/(mol·L^?1)	${\rho _{{\rm{Cu}}}}$(I)/(g·L^?1)	${\rho _{{\rm{Cu}}}}$(II)/(g·L^?1)	RD/%	${\rho _{{\rm{Cu}}}}$(III)/(g·L^?1)	RD/%	${\rho _{{\rm{Cu}}}}$(IV)/(g·L^?1)	RD/%
0.025	1.568	1.568	0.00	1.561	-0.45	1.549	−1.21
0.05	3.200	3.196	−0.13	3.183	-0.53	3.187	−0.41
0.1	5.268	5.267	−0.02	5.258	-0.19	5.258	−0.19

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