Final answer:
During recrystallization, allowing the mixture to return to room temperature allows the dissolved solute to re-crystallize and form solid crystals, resulting in a purer product.
Step-by-step explanation:
During recrystallization, it is important to allow the mixture to return to room temperature because it allows the dissolved solute to re-crystallize and form solid crystals. During recrystallization, allowing the mixture to return to room temperature allows the dissolved solute to re-crystallize and form solid crystals, resulting in a purer product.
When a mixture is heated, the solute is dissolved in the solvent, but as the temperature decreases, the solute becomes less soluble and starts to crystallize out of the solution. By allowing the mixture to return to room temperature, it gives enough time for the solute to recrystallize and separate from the impurities, resulting in a purer crystalline product.