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15.0 mL of 0.50 M NaOH is added to a 100.-mL sample of 0.330 M NH3...

15.0 mL of 0.50 M NaOH is added to a 100.-mL sample of 0.330 M NH3 (Kb for NH3 = 1.8 × 10–5). What is the equilibrium concentration of NH4 + ions?

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