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Limiting Reagent

1.) A student chose the wrong result of the two calculations of BaSO4, namely, the higher value. What would you expect to happen to the value of the % yield? Explain.

2.) In the process of filtration, what do you think has happened to the excess reagent which has not reacted? Where does it go, and do you think you could recover it, if needed? Explain.

Answer :

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Answer:

a) the percentage yield will exceed 100%

b) the excess reactant is filtered along with the barium sulphate precipitate. It is possible to recover the excess reactant by carefully washing the precipitate with water.

Explanation:

In the precipitation of barium sulphate, the ions in the reactants exchange partners in the product leading to an insoluble product.

In every reaction, there is a limiting reactant whose amount determines the amount of product that can be obtained. The reactant in excess remains in the system even after the reaction is completed and may be recovered alongside the product which leads to a percentage yield above 100%.

If the excess reactant is soluble in water, it can be recovered from the precipitate if needed by washing the precipitate with water.

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