Consider the following modifications for re-crystallization of 1.00 g benzoic acid that is contaminated with ophthalmic acid:
1. Dissolve the compound in a minimum of boiling water, cool to room temp for 20 mins, then in ice for 20 mins, then dry.
2. Dissolve the compound in 100 mL of water, and then dry
3. Dissolve in minimum boiling water, then allow the solution to boil to half its original volume, then dry
4. Cool at room temp for 1 min, then cool in ice for 20 mins, then dry.
Explain how would you expect the quantity of solvent and rate of cooling to affect yield and the purity? Discuss what are your expectations from the given modifications?