Question

1. What is the minimum volume of hot water needed to dissolve 0.200g phenacetin? How much phenacetin will remain in that volume of water once it cools?
2. Why is it important that all the solid dissolves in the hot solvent, before the solution is cooled?
3. How would you develop a simple, small scale test to determine a good recrystallization solvent if one is not listed in the procedure?

Answer 1

You need ro know the solubility of phenacetin in water (what temperature is hot?) as well as the solubility in cool (what is the temperature of cool?) water.