Isomerization.
Criteria for a solvent to be suitable for use to recrystallize a solid:
The solid sample should
(a) have a melting point higher than the boiling point of the solvent, (2) be insoluble in the solvent at room temperature,(3) soluble in the solvent at a higher temperature and (4) crystallize, from its hot clear solution in the solvent, upon cooling to room temperature
- Compare the physical constants to eliminate solvent choices.
- Determine solubility of each solid substance in each of the five solvents at room temperature .
- Identify solvents that are not suitable for recrystallization (Those in
which the solute dissolves completely at room temperature)
From among those solvents which may be suitable for recrystallization. - Determine solubility of each substance in hot solvents.
- Determine ability of a hot solution to produce crystals of the solid on cooling.