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Citation: 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. doi: 10.3866/PKU.DXHX202305023 shu

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

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

Corresponding author: Xianghong Li, lixhchem@mail.scuec.edu.cn
Received Date: 8 May 2023

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.
- Copper(II) iodate,
- Solubility product constant,
- Colorimetry
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