Abstract Addressing issues such as iodine vapor spillage,uneven stirring,and significant timing errors in the traditional“ammonium persulfate oxidation of iodide ion”reaction rate determination experiment,this paper proposes a digitized improvement scheme based on the interaction between Arduino and MATLAB.This scheme utilizes iodometric flasks and a constant-speed magnetic stirrer to ensure experimental safety and operational parallelism.It employs a GY-33 color sensor to monitor the color change of the reaction system in real time,and utilizes serial communication between MATLAB and Arduino to achieve automatic and precise timing and data processing at the color change endpoint.The results indicate that the improved experiment not only eliminates iodine pollution but also enhances the linearity of the determination of reaction order and rate constant.The relative error in the determination of activation energy is reduced from 2.7% in the traditional method to 0.2% using the GY-33 sensor,significantly improving the accuracy and reproducibility of the experiment.This design provides a feasible approach for the intelligent transformation of classic chemical experiments.
ZHANG Zhi-Qiu, LIN Yi-Jie, NIU Qian-Jia, LI Xin-Rui, DUAN Ji-Guo. Experimental Design of Chemical Reaction Rates and Activation Energy Using an Arduino-MATLAB Interactive System[J]. Chinese Journal of Chemical Education, 2026, 47(16): 72-78.
