Limiting reagent. See examples of limiting reagent calculations and solved problems with balanced chemical reactions. Learn what a limiting reagent is and how to find it using stoichiometry. Learn how to identify the limiting reagent in a chemical reaction using two methods: comparing reactant amounts or product amounts. See examples, definitions, and applications of limiting reagent concept. This is an important concept in stoichiometry and Chemistry exams. . A limiting reagent is the reactant in a chemical reaction that is completely consumed first, thus determining the maximum amount of product that can be formed. Learn about what a limiting reactant is, how to find a limiting reagent, and see worked out example problems on the limiting reagents. In a chemical reaction, the limiting reactant (or limiting reagent) is the substance that is completely used up first, stopping the reaction from continuing and thus determining the maximum amount of product that can be formed. Jun 30, 2023 · The limiting reagent is the one that is totally consumed; it limits the reaction from continuing because there is none left to react with the in-excess reactant. The limiting reactant (or limiting reagent) is the reactant that gets consumed first in a chemical reaction and therefore limits how much product can be formed.