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Citation: WANG Zhou, SHI Jianxin, PENG Min, ZHENG Saili, LI Lianyun, LAI Rong, ZHU Kejia. Improving Experiment on Determining the Empirical Formula of Hexamine Cobalt(III) Chloride: Measuring the Chlorine Content by Potentiometric Titration[J]. University Chemistry, ;2019, 34(2): 49-54. doi: 10.3866/PKU.DXHX201806014 shu

Improving Experiment on Determining the Empirical Formula of Hexamine Cobalt(III) Chloride: Measuring the Chlorine Content by Potentiometric Titration

School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China

Received Date: 15 June 2018

The experiment on preparation and empirical formula determination of hexamine cobalt(Ⅲ) chloride is a comprehensive experiment in the basic chemistry laboratory. The coordination compound was prepared by the reaction of CoCl₂ with H₂O₂ as the oxidant, excess ammonia and NH₄Cl with the catalysis of activated carbon. The empirical formula of the product was obtained by taking the integer of the ratio of NH₃, Co and Cl based on their contents from titration. In this paper, the titration method of Cl was improved. The Cl contents from the potentiometric titration method and Mohr method were compared. Results show that the potentiometric titration method has the advantages of higher precision, better reproducibility and reliability, as well as the better teaching effect.
- [Co(NH₃)₆]Cl₃,
- Empirical formula,
- Mohr method,
- Potentiometric titration method
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