What is the pH of a buffer formed from 50 mL of 15.0 M NH3 and...

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Question

What is the pH of a buffer formed from 50 mL of 15.0 M NH₃ and 53.5 g of NH₄Cl in enough water to make 500 mL of solution? (Kb = 1.8 x 10^-5)

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