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A 0.505 g sample of a monoprotic base (mm = 45.09 g/mol) was dissolved in water to produce 100.0 mL of solution with a pH = 11.84. What is the ionization constant of this base? A) 3.4 × 10^-1 B) 1.9 × 10^-23 C) 4.3 × 10^-4 D) 4.3 × 10^-5 E) 1.3 × 10^-11