比色法测碘酸铜溶度积常数实验的改进

doi:10.3866/PKU.DXHX202305023

University Chemistry ›› 2023, Vol. 38 ›› Issue (12): 257-261.doi: 10.3866/PKU.DXHX202305023

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Improvement in Colorimetric Detection of the Solubility Product Constant of Copper(Ⅱ) Iodate

Zidu Ding¹, Yingjie Lei¹, Yun Liang¹, Xianghong Li¹^,*(), Yanying Wang², Tao Huang¹

¹ School of Chemistry and Materials Science, South-Central Minzu University, Wuhan 430073, China
² Experimental Teaching and Engineering Training Centre, South-Central Minzu University, Wuhan 430073, China

Received:2023-05-08 Accepted:2023-06-06 Published:2023-08-17
Contact: Xianghong Li E-mail:lixhchem@mail.scuec.edu.cn

Abstract

Abstract:

In recent studies, ammonia, a chromogenic reagent, has been used to detect the solubility product constant of copper(Ⅱ) iodate via colorimetry. However, the use of ammonia can result in environmental pollution. As an alternative, glycine can be used as the chromogenic reagent. In this study, the reaction between glycine and copper(Ⅱ) ions was investigated in detail. The reaction time and glycine concentration were optimized by acquiring UV-Vis spectra, determining the appropriate conditions for reacting the copper(Ⅱ) complex with glycine. The absorption intensities at 640 nm for solutions of copper(Ⅱ) ions at different concentrations were measured, and the concentration of copper(Ⅱ) ions in saturated copper(Ⅱ) iodate was determined by using the standard curve. The solubility product constant was calculated, which was close to the literature value. The release of corrosive and volatile gas was prevented in this experiment, and the complex solution could be recycled to prevent environmental pollution. Therefore, this method is green and applicable for use in basic experimental teaching activities.

Key words: Copper(Ⅱ) iodate, Solubility product constant, Colorimetry

Zidu Ding, Yingjie Lei, Yun Liang, Xianghong Li, Yanying Wang, Tao Huang. Improvement in Colorimetric Detection of the Solubility Product Constant of Copper(Ⅱ) Iodate[J].University Chemistry, 2023, 38(12): 257-261.

Figures/Tables 5

References 13

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组别	A_{600 nm, 四氨合铜(Ⅱ)}	C(Cu²⁺)/(mol∙dm⁻³)	K_sp	A_{640 nm, 甘氨酸合铜(Ⅱ)}	C(Cu²⁺)/(mol∙dm⁻³)	K_sp
1	0.065	1.3 × 10⁻³	7.0 × 10⁻⁸	0.058	1.2 × 10⁻³	5.5 × 10⁻⁸
2	0.086	1.7 × 10⁻³	1.6 × 10⁻⁷	0.079	1.7 × 10⁻³	1.6 × 10⁻⁷
3	0.089	1.7 × 10⁻³	1.6 × 10⁻⁷	0.084	1.8 × 10⁻³	1.9 × 10⁻⁷
4	0.108	2.1 × 10⁻³	3.0 × 10⁻⁷	0.097	2.1 × 10⁻³	3.0 × 10⁻⁷
5	0.117	2.3 × 10⁻³	3.9 × 10⁻⁷	0.108	2.3 × 10⁻³	3.9 × 10⁻⁷
6	0.124	2.4 × 10⁻³	4.4 × 10⁻⁷	0.114	2.4 × 10⁻³	4.4 × 10⁻⁷

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Improvement in Colorimetric Detection of the Solubility Product Constant of Copper(Ⅱ) Iodate

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