Question

The best solvent for the crystallization of organic solid is in which:

• A. organic compound is highly soluble
• B. compound is soluble on warming
• C. compound is soluble at ${90}^0$
• D. compound is insoluble

Answer 1

Answer: (B)

compound is soluble on warming

Generally speaking you need to take polar solvents for polar compound and nonpolar solvents for nonpolar compounds. Many times a mixture of solvents works better. Once you have this basic idea, crystallization is a skill developed over a period of time by trial and error process. Even after long experience you may not hit the right solvent in the first try.