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Citation: Lancanghong Chen, Xingtai Yu, Tianlei Zhao, Qizhi Yao. Exploration of Abnormal Phenomena in Iodometric Copper Quantitation Experiment[J]. University Chemistry, ;2025, 40(7): 315-320. doi: 10.12461/PKU.DXHX202408089 shu

Exploration of Abnormal Phenomena in Iodometric Copper Quantitation Experiment

1.
School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China;
2.
School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;
3.
National Demonstration Center for Experimental Chemistry Education (University of Science and Technology of China), Hefei 230026, China

Corresponding author: Tianlei Zhao, Qizhi Yao,
Received Date: 20 August 2024
Revised Date: 16 October 2024

The iodometric determination of copper in alloys represents a fundamental experiment in analytical chemistry education. This study examines a notable case where a student erroneously used 20% KSCN solution instead of the prescribed HAc-NaAc buffer solution, yet surprisingly obtained CuSCN precipitate matching that of the standard procedure, albeit with significant discrepancies in titration results. Through systematic investigation of reaction intermediates and experimental validation, we elucidate the underlying chemical mechanisms responsible for this anomaly. This pedagogical approach not only enhances students' problem-solving capabilities but also demonstrates proper scientific investigation methodology for addressing unexpected experimental outcomes.
- Iodometric method,
- Copper determination,
- Abnormal phenomena,
- Reaction mechanism
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