# 3.2: Uses of Crystallization

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The main use of crystallization in the organic chemistry laboratory is for purification of impure solids: either reagents that have degraded over time, or impure solid products from a chemical reaction.

• 3.2A: Reagent Purification
If NBS were used without previous crystallization, yields would undoubtedly suffer as the quantity of active reagent would be unknown, and side produces might form due to the presence of excess bromine.
• 3.2B: Purification of Product Mixtures
If the crude product of a chemical reaction is a solid, it may be crystallized in order to remove impurities.

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