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A monoprotic acid with a Ka of 8.04 × 10-5 has a partition coefficient of 2.7 (favoring octanol) when distributed between water and octanol. Find the formal concentration of the acid in each phase when 100 mL of 0.10 M aqueous acid is extracted with 35 mL of octanol at (a) pH 4.00 and (b) pH 9.00.

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