The solubility of Caffeine in water is 0.6 g/100 mL at 0 degree C, 2.2 g/100mL a

Question

The solubility of Caffeine in water is 0.6 g/100 mL at 0 degree C, 2.2 g/100mL at 25 degree C and 67 g/100 mL at 100 degree C (3) Calculate the minimum amount of water required to dissolve 23.45 g of caffeine at 25 degree C and 100 degree C. How much caffeine would you theoretically recover if you recrystallized the solution from 100 degree C to 0 degree C The partition coefficient of ethanol is 0.5. If you washed a solution of 10 g of ethanol in 20 mL of cyclohexane with 15 mL of water 3 times, how much ethanol would remain in the organic phase?

Explanation / Answer

dissolve --> 23.45 g of caffein at 25°C:

S = 2.2 g / 100 mL at 25°C

for m = 23.45...

23.45/2.2*100 = 1065.90 mL of water at 25°C

for 100°C

S = 67 g / 100 mL at 25°C

for m = 23.45...

23.45/67 *100 = 35 mL of water at 100°C

b)

caffein for a recrystallized solution from 100°C to 0°C

S = 67 g --> S = 0.6 g

so.. for 100 mL --> 67-0.6 = 66.4 g of caffein per each 100 mL of solution will be recovered

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