Question

Does the amount of solvent used for a recrystallization have an influence on the yield of
product of a recrystallization? Please explain.

Answer 1

solvent using for recrystallization will influence the yield. Becauase if u add more amount of solvent the compound will dissolve in it and wil go while you do filteration. If u add less amount of solvent compound will not dissolve properly.

Adding appropriate amount of solvent will do crystallization with good yield.

In order to maximize your purity, you’d like to use enough solvent to dissolve the crystals and keep the impurities in solution even after cooling. In order to maximize your yield, you’d like to minimize the amount of solvent used so that as little as possible sample remains in solutio n after cooling. The best way to accomplish both goals is to use enough solvent so that it can dissolve everything while hot, but to use no more than the minimum required so as to maximize yield after cooling. The minimum required is when your solution is just barely at the saturation point while boiling hot. Use just enough solvent so that the material is just barely soluble, or is just a little cloudy to show that it’s just barely saturated.