The partition coefficient, Kp. at 25°C (1.e., room temperature) for compound A is 9.71 (for water and benzene). Starting with a solution of 16.6 g of compound A in 110 ml of water, what is the total percent of compound A that is extracted into the benzene after two successive extractions of 65.0 mL benzene each? (Enter a value with 3 sig figs and do not include the % sign)

The partition coefficient, Kp. at 25°C (1.e., room temperature) for compound A is 9.71 (for water and benzene). Starting with a solution of 16.6 g of compound A in 110 ml of water, what is the total percent of compound A that is extracted into the benzene after two successive extractions of 65.0 mL benzene each? (Enter a value with 3 sig figs and do not include the % sign)

Macroscale and Microscale Organic Experiments

7th Edition

ISBN:9781305577190

Author:Kenneth L. Williamson, Katherine M. Masters

Publisher:Kenneth L. Williamson, Katherine M. Masters

Chapter5: Distillation

Section: Chapter Questions

Problem 3Q

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Conventional wisdom says that it’s always better to extract with several small portions rather than one large portion. Is this really true? Compound A has a partition coefficient (Kp) of 3.5. If you start with a solution of 150 mg of compound A in 1.0 mL water, the amount that is recovered by extraction with one 300 uL portion of ether is 76.8 mg. How much A would be recovered after extraction with two 150 uL portions of ether instead of one 300 uL portion of ether?
The partition coefficient for compound A between hexanes and water is 12. Assume 10 g of A is dissolved in 100 mL of water. This aqueous solution is extracted with 30 mL of hexanes, for a total of four extractions, how much of A can be extracted? State your answer in terms of grams. Do not include units in your answer. Use three significant figures in your answer. Answer:
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The distribution coefficients for a compound are as follows: Kcyclohexane/water = 1.5 Kpentane/water = 11.2 %3D Kdiethyl ether/water = 5.1 %3D Which solvent system, would give the best extraction into the organic solvent? Explain why.
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