Which types of solvents are commonly used in recrystallization?

Recrystallization is a purification technique commonly used to isolate and purify solid compounds based on their solubility characteristics. The choice of solvent during recrystallization is critical, as it must dissolve the compound at high temperatures but not at low temperatures, allowing pure crystals to form as the solution cools.

The correct choice highlights that polar and non-polar organic solvents, such as ethanol and methanol, are often employed in this process. Polar solvents like ethanol and methanol can effectively dissolve many organic compounds, which are typically polar themselves or can exhibit some degree of polarity, facilitating the dissolution at elevated temperatures. When the solution cools, the solubility decreases, leading to the formation of pure crystals of the desired compound.

In addition, selecting an appropriate solvent is essential for achieving a good yield of high-purity crystals. The understanding of polarity helps in making these solvent choices, thus highlighting the versatility of using both polar and non-polar solvents in recrystallization processes.