Question

The solubility of acetanilide is 18.5 g in 100 ml of methanol at 0 °c, and 59.2 g in 100 ml of methanol at 60 °c. what is the maximum percent recovery that can be achieved for the recrystallization of acetanilide from methanol?

Answer 1

Percent recovery is an indication of how much of active ingredient one is able to recover after purification method.

The formula for percent recovery is:

$Percent recovery = \frac{weight after crystallization}{weight of substance used initially}$

$weight after crystallization = 59.2 g -18.5 g = 40.7 g$

$weight of substance used initialy = 59.2 g$

Substituting the values in the above formula:

$Percent recovery = \frac{40.7}{59.2}\times 100$

$Percent recovery = 68.75$ %

Hence, the maximum percent recovery that can be achieved for the recrystallization of acetanilide from methanol is $68.75$ %.