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Citation: Tianqi Liu, Yijie Liu, Tianwei Song, Dongsheng Liang, Qizhi Yao. Influence of Calcium Oxalate Precipitation on Determination of Calcium Content in Dolomite[J]. University Chemistry, ;2023, 38(8): 170-176. doi: 10.3866/PKU.DXHX202208028 shu

Influence of Calcium Oxalate Precipitation on Determination of Calcium Content in Dolomite

1.
School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China;
2.
National Demonstration Center for Experimental Chemistry Education (University of Science and Technology of China), Hefei 230026, China

Corresponding author: Qizhi Yao, qzyao@ustc.edu.cn
Received Date: 5 August 2022

“Determination of calcium content in dolomite by potassium permanganate method” is a classical analytical chemistry experiment to train students' comprehensive experimental ability, including dissolution of dolomite ore sample, preparation and washing of calcium oxalate precipitate, concentration calibration of potassium permanganate solution and titration of calcium oxalate precipitate. Because of the complexity of the experiment process and the many influence factors, it is very difficult that students control the measurement error within 3‰ in the experiment. Therefore, we guide students to precipitate calcium oxalate from acid-dissolved dolomite solution under different experimental conditions, investigate the relationship between the particle size and surface morphology of calcium oxalate precipitate and the determined calcium contents, and thus revealing the control factors affecting the accuracy of calcium content determination. It not only deepens the students' understanding to the experimental process, but also stimulates their interest in learning chemical experiments, improving their experimental ability and strengthening their confidence in scientific research.
- Potassium permanganate method,
- Redox titration,
- Calcium oxalate,
- Morphology,
- Titration error
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