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Citation: Jianan Fang, Youhao Gu, Zexuan Gui, Laiying Zhang, Jiawei Yan, Ruming Yuan, Xiaoming Xu. Experimental Improvement and Expansion of the Electromotive Force Method to Determine the Mean Activity Coefficient of Electrolyte Solution[J]. University Chemistry, ;2025, 40(11): 263-271. doi: 10.12461/PKU.DXHX202504055 shu

Experimental Improvement and Expansion of the Electromotive Force Method to Determine the Mean Activity Coefficient of Electrolyte Solution

National Demonstration Center for Experimental Chemistry Education (Xiamen University), College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, China

Corresponding author: Laiying Zhang, Jiawei Yan,
Received Date: 15 April 2025
Revised Date: 26 June 2025

The electromotive force method for determining the mean activity coefficient of electrolyte solutions represents a fundamental experiment in physical chemistry. However, the conventional experimental procedure necessitates continuous hydrogen gas bubbling into the solution to establish a hydrogen electrode, thereby introducing potential safety hazards associated with hydrogen leakage and explosion risks. To mitigate these concerns, this study proposes an innovative modification: the implementation of electrolysis for hydrogen electrode preparation, thereby eliminating the need for continuous hydrogen gas introduction. This improved methodology obviates the requirement for hydrogen cylinders or generators during measurements, effectively eliminating the risks of hydrogen leakage and explosion while ensuring experimental safety. Furthermore, this redesigned experimental approach not only enhances students’ comprehension of theoretical concepts in physical chemistry but also equips them with practical skills in hydrogen electrode preparation through electrolysis.
- Laboratory safety,
- Physical chemistry,
- Experiment improvement,
- Self-made electrode
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