Submitted by benny
Submitted by Matt
Percent recovery = amount of substance you actually collected / amount of substance you were supposed to collect, as a percent.
So another way of putting it:
Percent Recovery = (pure/impure) x 100
Let's say you had 10.0g of impure material and after recrystallization you collected 7.0 g of dry pure material. Then your percent recovery is 70% (7/10 x 100).
You need to make sure you material is dry or else the mass will be more than it actually is. That's why students sometimes calculate percent recoveries greater than 100% (which is impossible).
Overview of recrystallization:
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