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Determine the ammonia concentration of an aqueous solution that has a pH of 11.50. The equation for the dissociation of NH3 (Kb = 1.8 × 10^-5) is NH3(aq) + H2O(l) ⇌ NH4+(aq) +OH-(aq). A) 2.5 M B) 5.7 × 10^-3 M C) 0.55 M D) 3.2 × 10^-3 M