Question

The solubility of acetanilide in your recrystalization solvent is 5 mg per ml at 10 degrees C. I started with 0.497 grams of acetanilide.

a.) Calculate the maximum percent recovery in this experiment, assuming 15 ml recrystalization solution is filtered at 10 degrees celcius.

b.) Calculate the percent recovery of the acetanilide produced in your experiment.

Answer 1

Since the solubility of acetanilide = 5 mg/mL = 5 g/L

so 1 mL solution contains 5 mg of acetanilide.

so 15 mL of solution contains 5/1 * 15 mg of acetanilide

                             = 75 mg of acetanilide

Percent or recovery = (mass of the soluble substance / total mass initially taken) * 100

percent or recovery = 75 * 10^-3/0.497 * 100 = 15.09 %