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Recrystallization "works" by allowing crystals of the desired compound to grow in a cooling solution, while...

Recrystallization "works" by allowing crystals of the desired compound to grow in a cooling solution, while excluding impurity molecules from the crystal because they will not "fit" properly in the highly ordered crystal. If any impurity molecules did manage to get into one of the forming crystals, what would be the effect on the melting point of that particular crystal?
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