CAIE A-Level Chemistry A2 25.2.3 Factors Affecting Partition Coefficient Topic Practice

Iodine is found naturally in compounds in many different oxidation states.

Iodide ions, $\mathrm{I}^{-}$, react with acidified $\mathrm{H}_{2} \mathrm{O}_{2}(\mathrm{aq})$ to form iodine, $\mathrm{I}_{2}$, and water. This reaction mixture is shaken with cyclohexane, $\mathrm{C}_{6} \mathrm{H}_{12}$, to extract the $\mathrm{I}_{2}$. Cyclohexane is immiscible with water.

Suggest how the value of $K_{p c}$ of $\mathrm{I}_{2}$ between hexan-2-one, $\mathrm{CH}_{3}\left(\mathrm{CH}_{2}\right)_{3} \mathrm{COCH}_{3}$, and water compares to the value given in (a)(ii). Explain your answer.