Answer :
during a recrystallization, the dissolved compound is sometimes treated with activated carbon because Activated charcoal is carbon treated with oxygen making it highly absorbent .
Activated carbon is carbon treated with oxygen and has excellent adsorption power. Crystallization helps remove impurities, but charcoal removes all impurities during the process, so the crystals that form are completely pure.
Recrystallization is a chemical refining technique. When a mixture of compound and impurity is dissolved in a suitable solvent, either the compound of interest or the impurity is removed from the solution while the other remains. It is named for the crystals that often form when compounds fail. Alternatively, recrystallization may refer to the spontaneous growth of larger ice crystals at the expense of smaller ice crystals.
Recrystallization is the process of purifying compounds. The most typical situation is when the desired "Compound A" is contaminated with a small amount of "Impurity B". There are several purification methods that can be tried (see Separation Methods), recrystallization being one of them.
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