Below is a solubility curve for an unknown compound. a. Suppose 15 grams of the unknown is stirred in 50mL of water at 80C. Will all 15 grams dissolve? Explain. b. A solution was prepared by dissolving 5g of unknown in 25mL of boiling water. What temperature would the solution have to be cooled to before crystals began to appear? c. If the solution in the question above were cooled to 0C, what mass of unknown would erystallize? What mass of unknown would remain in solution? Show all work. d. Your sulfanilamide contained a blue impurity that remained in the mother liquor after recrystallization. Draw a likely solubility curve on the graph above that represents the blue impurity. 4. Why was it important to wash your crystals with fresh 95% ethanol following vacuum filtration and why did it have to be cold