A 200 mg sample of K+-saturated Cheto montmorillonite (CEC = 120 cmolc kg-1) is equilibrated with a 45 mL volume of a pH 4 KCl solution that initially contains 12 mmol L-1 aniline, an aromatic amine (pKa = 4.60 for the amine deprotonation reaction: ArNH3 + ? ArNH2 0 + H+). At equilibrium, the solution contains 30 mmol L-1 K+ and 8 mmol L-1 aniline. Compute the Vanselow selectivity coefficient (KV) for the reaction: ArNH3 +(aq) + KX(ex) ? ArNH3X(ex) + K+(aq) (assume that molar concentrations and activities are equivalent).
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