what is limiting reagent
Answers
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LIMITING REAGENT
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➢ Many a time, the reactions are carried out when the reactants are not present in the amount as required by a balanced chemical reaction.
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➢ In such situations, one reactant is in excess over the other. This reactant which is present in the lesser amount gets consumed after sometime and after that no for the reaction takes place where be the amount of the other reactant present.
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➢ Hence the reactant which gets consumed, limits the amount of product formed and is therefore called limiting reagent.
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Note
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➢ In performing stoichiometric calculations this aspect is also to be kept in mind.
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HOPE IT HELPS UHH ๛
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When a reaction is carried out, the reactants combine with each other is definite proportions as stated by the Law of Constant Proportions.
This is why the reactant is excess gets left un-reacted after the reaction is complete. The reactant that gets completely used is called the Limiting Reagent because it was because of this element that the reaction ended and the other element was left un-reacted.
Example - Hydrogen and Oxygen react in the ration 2:1. That means 2 moles of Hydrogen reacts with 1 mole of Oxygen to form 2 moles of Water.
If we take 1.9 moles of Hydrogen and 1 mole of Oxygen. There would be a small amount of Oxygen which would be left un-reacted. In this case, Hydrogen would be called as the Limiting Reagent.