The crude product was then recrystallized to purify the compound. The recrystallized product of 1,2-diphenylethane-1,2-diol weighed 0.07 g and obtained a melting point of 138-139 ℃. The melting point for the recrystallized product is higher than the melting point of the crude product. This makes sense because the recrystallized product is pure compared to the crude product. Yet, the melting point of the recrystallized product is lower than the melting point of 1,2-diphenylethane-1,2-diol because it still obtains a minimal amount of impurities. The impurities may be due to not allowing the reaction to complete before ice bathing, filtrating, and recrystallizing the product.
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