Compound X has a partition coefficient (defined as at equilibrium)

CHEMISTRY · Single correct · A Level · Chemistry · Chromatography · Chromatography

Problem

Compound X has a partition coefficient Kether/water=10.0K_{\text{ether/water}} = 10.0 (defined as [X]ether[X]water\dfrac{[X]_{\text{ether}}}{[X]_{\text{water}}} at equilibrium). A chemist needs to extract X from 100 mL of water using diethyl ether. Which option will leave the smallest percentage of X in the aqueous layer? (a) One extraction with 100 mL of ether (b) One extraction with 25 mL of ether followed by one extraction with 75 mL (c) Four successive extractions with 25 mL of ether each (d) Two successive extractions with 50 mL of ether each

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