Consider the reaction shown of the synthesis of benzilic acid. Use the given inf

Question

Consider the reaction shown of the synthesis of benzilic acid. Use the given information to determine how moles of each reactant were used, which is the limiting reactant, the number of equivalents of each reactant used, and the theoretical yield of benzilic acid. HO OH Benzil 8.0 M Potassium Hydroxide Benzilic Acid (KOH) Mass/ 0.330 g 1.67 mL Volume Used 228.24 g/mol Molecular 210.23 g/mol 56.12 g/mol Density 22 Moles of benzil used Limiting reactant Moles of KOH used Scroll down to benzil Number view whole O potassium hydroxide assignment. mol mol

Explanation / Answer

1.

Moles of benzil used = mass of benzil / mol. wt. of benzil

Moles of benzil used = (0.330g) / (210.23g/mol) = 0.00157 mol

2.

Moles of KOH used = volume of KOH(L) x molarity of KOH

Moles of KOH used = (0.00167L) x (8.0 mol/L) = 0.0134 mol

3.

Benzil is used in less quantity (0.00157 mol) than KOH (0.0134 mol). Reaction shows that one equivalent benzil reacts with one equivalent of KOH.

Thus, benzil is the limiting reagent.

4.

Since benzil is limiting reagent, its equivalent is 1.00

5.

Equivalents of KOH = moles of KOH / moles of benzil

Equivalents of KOH = (0.0134 mol)/ (0.00157 mol) = 8.54

6.

Theoretically one mole of benzil should give one mole of benzilic acid.

Thus, theoretical yield of benzilic acid = moles of benzilic acid x mol. wt. of benzilic acid

Theoretical yield of benzilic acid = 0.00157 mol x 228.24 g/mol = 0.358 g

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