Answered: Compound A has a partition coefficient…

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter13: The Chemistry Of Solutes And Solutions

Section13.7: Colligative Properties Of Solutions

Problem 13.11PSP

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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?

K₁=
Kp
solubility in organic solvent
solubility in water
K₂=3.5=
P
x mg A ở
300 μL ether
-
-150-x mg A
1000μL water.
Solve for x...
x = 76.8 mg A
Ö

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