Question

Na2CO3 (aq) + CaCl2 (aq) + CaCO3 (s) + 2NaCl (aq). What is the limiting reagent? What is the experimental yield (actual yield) of CaCO3?

Answer 1

Limiting Reagents

Let’s say I like one slice of ham between two slices of bread in my sandwiches. If I only have three slices of

ham at my disposal, then all I can make is three sandwiches; that is assuming that I have six slices of bread.

In fact, it doesn’t matter whether I have six slices or forty-six slices, I can only make three sandwiches since I

am limited by the amount of ham I have.

The same is true of reactions. I have a large quantity of Na2CO3 but I cannot produce any chalk unless I also

have CaCl2. Stoichiometry allows us to compare the amount of various substances involved in a reaction if we

know the balanced chemical equation and the quantities of the other substances produced or needed. In

order to determine which of the reactants is limiting, we must take into account both reactants’ amounts

present and how they relate stoichiometrically to one another in the balanced equation.

Percent Yield:

Reactions are expected to go to completion, but it is always another matter when you go into the lab and

perform it. Preparations often require a variety of manipulations and transfers that cause a loss of product.

Some of these losses are due to human error that can be eliminated with experience and improved technique.

However, more often it is due to the actual procedure involved. Percent Yield is a measure of the efficiency

of the experimental design.

Hope it helps

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