Abstract: The rate constants in chemical reactions are highly temperature-sensitive. In kinetic experiments, the solutions are usually preheated respectively before transferring them quantitatively for reaction. This common practice often leads to temperature imbalances due to the solution’s exposure to room temperature during transfer process, causing significant initial data errors and distortion of kinetic curves. Moreover, the simultaneous operations required for quantitative transfer, initiation of timing, and solution mixing can overwhelm inexperienced students and lead to errors. Excessive reagent use during preheating can also result in waste. To address these issues, our group has developed a “trousers-shaped” kinetic reaction flask along with its supporting devices. This flask enables gradual solution transfer, preheating, and mixing, making the experimental procedure more logical and reducing both temperature-induced errors and student operation mistakes, while also saving reagents. The flask has been practically applied in our university’s physical chemistry experimental teaching, enriching the experimental content, improving students’ operational skills, and enhancing their ability to analyze and solve problems comprehensively. It also contributes to elevating students’ research literacy and the overall effectiveness of experimental teaching.

Key words: “Trousers-shaped” reaction flask, Chemical kinetics, Experimental teaching