22. A series of organic solubility curves are shown below, for a variety of solv

Question

22. A series of organic solubility curves are shown below, for a variety of solvents. The y axis is amount of solvent per unit volume (mg/mL) and the x axis is degrees C. ACN 50 40 30 20 10 Aceton. 40 45 50 10 15 20 25 30 35 a. Which is the worst solvent for crystallization for this compound? (3) b. Justify your answer to part (a) in one sentence (3) Use the triangle solvent curve (Hac) to answer the following questions: I. How much of the solvent will be needed to dissolve 0.50 g of compound, at 50 °C? (4) ll. How much solute will remain in this solution when it is cooled to 10°C? (4)

Explanation / Answer

Recystallization

a. Among all the solvents shown above, water (H2O) is the worst solvent for the recrystallization of the given compound.

b. The compound remains almost insoluble in water at all the temperatures.

I. the solubility of Hac given at 50 oC is 40 mg/ml

So for a 0.5 g sample we would need = 0.0125 ml

II. When the solution is cooled at 10 oC, the amount of solute remained in solution would be = (0.5- 0.175) = 0.325 mg. that is the amount of solute that remained in dissolved state is 0.175 mg.

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