In a chemical reaction with 5 g of sodium bicarbonate and 90 mL acetic acid, what is the theoretical yield and how is it found? NaHCO3+C2H4O2 –––> CH3COONa + H2O + CO2

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ncchemist | eNotes Employee

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First we need to convert the amounts of NaHCO3 and acetic acid into moles and then compare the two.

5 g NaHCO3 * (mole/84 g) = 0.06 moles NaHCO3

90 mL AcOH * (1.05 g/mL) * (mole/60.05 g) = 1.57 moles AcOH

From the balanced chemical equation you gave in your question, we know that both species react together in a 1 to 1 molar fashion.  As a result, we have many more moles of acetic acid present than NaHCO3, so sodium bicarbonate will be the limiting reagent.  Thus, 0.06 moles of NaHCO3 will produce 0.06 moles of CH3COONa (sodium acetate).  Let's convert this to grams.

0.06 moles AcONa * (82.03 g/mole) = 4.92 g AcONa

So 5 g of sodium bicarbonate will theoretically produce 4.92 g of sodium acetate.  So the theoretical yield is 4.92 g.

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