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0.653 g of a monoprotic acid (mm = 157 g/mol) is dissolved in water to produce 50.0 mL of a solution with pH = 2.13. Determine the ionization constant of the acid. A) 3.9 × 10^-2 B) 3.6 × 10^-6 C) 7.9 × 10^-3 D) 6.6 × 10^-4 E) 8.9 × 10^-2