question archive 1) The solubility of acetanilide in water at 100 °C is 5
1) The solubility of acetanilide in water at 100 °C is 5
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1) The solubility of acetanilide in water at 100 °C is 5.0 g / 100 mL. At 0 °C, the solubility of acetanilide in water is 0.54 g / 100 mL.
a- What is the minimum amount of water in which 2.50 g of acetanilide can be dissolved at 100 °C? Show all calculations and use appropriate units for full credit.
b. Based upon your answer to part a., when this 100 °C solution is cooled to 0 °C, how much acetanilide will remain in solution and how much will precipitate/crystallize out of the solution? Show all calculations for full credit.
c. What is the percent recovery of acetanilide?
d. If 100 mL of water were used for the recrystallization of 1.00 g of acetanilide, would the percent recovery be higher or lower than the answer to part c? You do not need to calculate a new recovery, but clearly explain why the recovery would be higher or lower
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Answers:
a) 50 mL
b) 2.23 g acetanilide crystals and 0.27 g acetanilide remain in solution
c) 89.2%
d) The percent recovery should be less than what was obtained from part c. By ratio and proportion, the minimum amount of solvent that will give the same recovery as is 20 mL. Additional volume of water in the solution will make the original mixture unsaturated, making it more difficult to recrystallize the solution at 0oC.
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