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0.272 g of a monoprotic acid (Mw = 189 g/mol) is dissolved in water to produce 25.0 mL of a solution with pH = 4.93. Determine the ionization constant of the acid. A) 2.4 × 10^-9 B) 4.1 × 10^-8 C) 1.4 × 10^-10 D) 2.1 × 10^-4 E) 2.8 × 10^-7