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 = (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 = (40.7)/(59.2)* 100`

`Percent recovery = 68.75` %

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