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In the organic laboratory, crystallization is usually the most rapid and convenient method for purifying the products of a reaction. Initially you will be told which solvent to use to crystallize a given substance and how much of it to use; Later on you will judge how much solvent is needed, acid finally the choice of both the solvent and its volume will be left to you. It takes both experience and knowledge to pick the correct solvent for a given purification.

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Initiall,y you will be told which solvent to use to crystallize a given substance and how much of it to use.
Later on, you will judge how much solvent is needed.
Finally, the choice of both the solvent and its volume will be left to you.
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