#### • Class 11 Physics Demo

Explore Related Concepts

# Limiting Reagent Calculator

We know a chemical reaction is mainly depends upon the number and type of recants and products.
The chemical equation represents the conversion of reactants to products by a single headed arrow between them.

As the reaction moves in the forward direction, the reactants tend to convert in to the products. In other words; with time the concentration of reactants decreases and concentration of products increases.
What will happen if there is no more any one of the reactant but other one is present in reaction mixture?
Definitely the reaction will interrupt due to lack of one of the reactants; does not matter that other reactant is found in enough quantity. In such case; how will we determine the concentration of product formed during reaction?

For the determination of concentration of product formed in such condition, first we have to determine the reactant which is limiting the chemical reaction. Such reactant is called as limiting reagent.

The limiting reagent calculator can be used to determine such regents for a certain chemical reaction. We can found this reagent by the calculation of the amount of formed during reaction by each reactant.
The reactant which will produce less amount of product will be limiting reagent for that chemical reaction. Let’s discuss some common examples. In a car factory, for assembling a car we mainly require 4 tires and 2 headlights.

Suppose here tires and headlights are reactants and car is the product of the chemical reaction.
We have 24 tyres and 16 headlights, so let’s determine how many cars can we make?
With 24 tyres, you can produce 6 cars s 4 tyres are required for each car.
With 16 headlights, 8 cars can be built as each car will need 2 headlights. Although we can manufacture more cars but tyres are not available in enough number. Hence tyres are limiting factor or limiting reagents here and headlights act as excess part.

Overall it is a reactant which will completely use in a reaction and helps in the determination of reaction completion. We can also calculate the amount of reactant which is required to react with another reactant which the help of stoichiometry. It limits the reaction from starting as there is none left to react with the now excess reactant. We can two ways for the determination of these types of reagents either by comparing the mole ratio of the amount of reactants used in the reaction or by calculating the grams of products formed from the given quantities of reactants which give the information about that reactant which involves in the formation of least amount of product.
In first way; starts with the finding the limiting reagent by checking the number of moles of all reactants involves in the reaction.

Then write the balanced chemical equation and convert all given information into moles. Now determine the mole ratio and compare it with the actual ratio. Use this amount for the determination of the amount of product formed during reaction.
In 2nd method; we can calculate the limiting reagent with the calculation and comparison of the amount of product and reactant. Write the balance the chemical equation convert all the given values in moles.
With the help of stoichiometry, calculate the mass of each reactant and use them in the calculation of amount of product formed during reaction. The reactant which is formed a lesser amount of product is called as limiting reagent while another one is known as excess reagent.