A Dramatic Classroom Demonstration of Limiting Reagent Using the Vinegar and Sodium Hydrogen Carbonate Reaction

摘要

The reaction between sodium hydrogen carbonate (NaHCO,)1 and vinegar (CH3COOH) has been widely used to demonstrate concepts of stoichiometry and limiting reagent (1-7), Aware that visualization is important to chemistry understanding and that it can arouse students' curiosity and enthusiasm, (8) we describe a dramatic and practical demonstration that allows students to discover the concept of limiting reagent by observing the change in gas volume when a fixed volume of vinegar reacts with a gradually increasing mass of sodium hydrogen carbonate.