What is the limiting reactant reagent and what is excess reagent in recrystallization?

Answer 1

The Limiting Reactant is the smaller number once you compare the two reactants with one product. The product that you are comparing them both with must be the same. The Excess Reactant is the larger number, or the amount left over in the chemical reaction.

Answer 2

No, quite simply, the limiting reactant limits the reaction and determines how much of the products are made. The excess in the reaction is just called the "excess reactant", which still remains after the limiting reactant is used up.

Answer 3

The limiting reagent is the reactant that would yield the least amount of product, whereas the reagent in excess/excess reagent is the reactant that would yield the most amount of product or what would be left over. In order to identify which reagent is excess and which reagent is limiting, you must convert the mass of reach reactant to the mass of the product.

Find the limiting reagent:

__A + __B --> __X

1. Multiply the mass of the reactant by the # molecules of the product and its molar mass.

2. Divide the above by the # molecules of the reactant which is multiplied by its molar mass.

Mass reactant A --> mass product X

Mass reactant A # molecules X x molar mass X = Mass product yielded by A

--------- # molecules A x molar mass A

Mass reactant B --> mass product X

Mass reactant B # molecules X x molar mass X = Mass product yielded by B

--------- # molecules B x molar mass B

Whichever mass is the lowest is the limiting reagent; whichever mass is the highest is the reagent in excess.

Answer 4

limiting reactant/reagent is the reactant/reagent that is in lesser amount in terms of the number of moles. this is the reactant/reagent that determines the theoretical yield of a product(s) in a chemical reaction

excess reactant/reagent is the reactant/reagent that is in greater amount in terms of the number of moles.

Answer 5

A limiting reagent is completely used up during the reaction whereas the excess reagent is the left over substance after the reaction has taken place. Excess reagent = initial reagent amount - limiting reagent amount.

Answer 6

The limiting reagent limits the amount of product that can be produced. In the reaction between (2)Na + Cl2 ---> (2)NaCl2 you can see that 2 moles of Na reacts with 1 mole of Cl this means there must be twice as many moles of Na for the reaction to have the perfect stoichi ration. if there is less than twice the amount of Na then its the Limiting Reagent and hence limiting the amount of NaCl2 that can be produced. if there s more than the required 2 moles and there isnt the required extra Cl than Cl is the LR and the Na is the XS.

Basically the Limiting Reagent controls the amount of product that can be produced and the Excess does not do anything apart from react with all the lim iting reagent with some left over.

Answer 7

The limiting reactant is the reactant which governs the amount of product(s) yielded in a chemical reaction. This quantity is calculated using the stoichiometry of a given reaction. The excess reactant is thus not used in calculating the theoretical yield.

For example, consider a reaction 4A + B = 2C, with 4mol A and 2mol B. A is the limiting reagent because it can only produce 2mol C based on the stoichiometry, whereas B could produce 4mol C. Thus, the theoretical yield for the quantities of reactants given is based on A, and it is 2mol C.