What is the purpose of using a slurry in recrystallization?

What is the purpose of using a slurry in recrystallization?

• A. To speed up evaporation of solvents
• B. To facilitate cooling and crystallization of the desired compound
• C. To dissolve impurities
• D. To prevent oxidation during the process

Answer: (B)

Using a slurry in recrystallization serves a specific purpose where it facilitates cooling and the crystallization of the desired compound. When the solution is cooled, the solubility of the substance decreases, leading to the precipitation of the compound. The slurry, consisting of a mixture of the crystallizing solvent and the solution containing the dissolved compound, ensures that the temperature drop is uniform and controlled, promoting even crystallization. This method allows for the formation of pure crystals as the compound solidifies out of the solution while impurities, which remain dissolved in the solvent, are left behind. The key aspect of using a slurry is that it provides a conducive environment for the establishment of a supersaturated solution that drives the crystallization process effectively.

Using a slurry in recrystallization serves a specific purpose where it facilitates cooling and the crystallization of the desired compound. When the solution is cooled, the solubility of the substance decreases, leading to the precipitation of the compound. The slurry, consisting of a mixture of the crystallizing solvent and the solution containing the dissolved compound, ensures that the temperature drop is uniform and controlled, promoting even crystallization.

This method allows for the formation of pure crystals as the compound solidifies out of the solution while impurities, which remain dissolved in the solvent, are left behind. The key aspect of using a slurry is that it provides a conducive environment for the establishment of a supersaturated solution that drives the crystallization process effectively.