(b) Acid is added to an octanol/water immiscible solution, at 298 K and l atm pr

Question

(b) Acid is added to an octanol/water immiscible solution, at 298 K and l atm pressure. At equilibrium the concentration of the acid in the aqueous phase is 0.18 M and that in the organic phase is 0.36 M. H^+ (aq) rightwardsherpoonoverleftwardsharpoon H^+ (octanol) Determine the value of the equilibrium constant for the phase equilibrium. (ii) If the acid concentration in the aqueous phase was 0.28 M, determine the concentration of the acid in the octanol, at 298 K and 1 atm pressure. (iii) Use a thermodynamic argument to explain why material is spontaneously transferred from a phase of high chemical potential (mu) to one of lower chemical potential

Explanation / Answer

Ans (i) Keq = [H+]octanol / [H+] aqueous

Keq = 0.36/0.18 = 2

(ii) [H+] = keq * 0.28 = 0.56

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