Pre-lab Questions (These should be answered and given to your instructor at the beginning of the lab). 1. Why is benzoic acid soluble in sodium hydroxide, but not in pure water? 2. What is the difference between sublimation and distillation? 3. Look up the densities of the solvents used in part G. For each pair of solvents determine which should be on the top if they are immiscible. See if your experimental results match what you expect. 4. Why should we use an Erlenmeyer flask for recrystallization not beaker? Summary of Procedure