Recrystallization is often used at the end of a synthesis. Choose the most accurate answer/s to explain the purpose of recrystallization and how it is done effectively? Note there may be more than one correct answer.
1.Dissolve the crude product in the minimum amount of cold solvent and then heat it to boiling point so all the impurities can be evaporated.
2.Dissolve the crude product in the minimum amount of boiling solvent to keep the solution of the product at its saturation point and then allow to cool so pure crystals will form.
3.Recrystallization is done to improve the yield of the byproduct
4.If too much solvent is used during recrystallization the percent yield of the reaction will be lower.
5.Dissolve the crude product with excess amount of cold solvent so the crystals can immediately form, and pure product can be collected by vacuum filtration.
6.Recrystallization is done to further purify the unwanted byproduct of the reaction.
7.Recrystallization is done to remove trace impurities from the final product.