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Thus, we will need to purify this component before giving any conclusion because the substance contains traces of impurities following the separation. Many techniques can be used to perform the purification in order to remove all impurities such as recrystallization, chromatography, distillation or sublimation. In this case, our unknown, a solid, can be purified by recrystallization. This technique consist mainly on the solubility of the substance where the impure solid is dissolved in boiling water and crystallized later on when the solution is cooled to room temperature. Each solid, depending on its physical properties, needs a different volume of water that can be estimated by the mass of the substance...
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