Digital Experiment for Detecting Activation Energy in the Reaction Between H2O2 and KI
CHEN Hang1, DU Qin-Zhi1, GE Lin2, ZHANG Ming-Xiao2, CHEN Shi-Hong2**
1. Chongqing No.8 Secondary School, Chongqing 400030, China; 2. School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
Abstract Based on the independently developed digital experimental system, this study developed an activation energy determination experiment of the reaction between H2O2 and KI. The automatic temperature rise was achieved through the heating rod, and precise temperature control was realized by the temperature sensor. The potential sensor was used to characterize the change of potential over time during the reaction process. Based on the potential jump shown in the potential-time curve, the reaction time was determined, thereby achieving the accurate measurement of the activation energy. At the same time, the molar ratio of H2O2 to KI, the dosages of Na2S2O3, the acidity of the solution and the reaction temperature were optimized. This digital experiment effectively resolves the bottlenecks of “unstable temperature control”, “inaccurate timing” and “subjective endpoint determination” in the traditional activation energy determination experiment, making the abstract activation energy visual and quantifiable, which is conducive to improving the teaching quality of basic chemical reaction principles and the development of students' subject literacy.
CHEN Hang, DU Qin-Zhi, GE Lin, ZHANG Ming-Xiao, CHEN Shi-Hong. Digital Experiment for Detecting Activation Energy in the Reaction Between H2O2 and KI[J]. Chinese Journal of Chemical Education, 2026, 47(3): 107-114.
