Question

What will happen if too much solvent is added to the sample during crystallization?

• A. The recovery of pure sample increases
• B. The recovery of pure sample decreases
• C. The recovery of pure sample takes place at a faster rate
• D. No change in the recovery of pure sample

Answer 1

The correct option is B The recovery of pure sample decreases

Impure compounds are sparingly soluble in a solvent at room temperature and appreciably soluble at high temperatures. The solution is concentrated by heating, to get a supersaturated solution. On cooling, the pure compound crystallises out and is removed by filtration. If too much solvent is used, the recovery of the substance by crystallization will be decreased.