60 mL of 0.10 M aqueous NH₃ is mixed with 20 mL of 0.10 M HCl at 298 K. What is the pH of the resulting solution? (pKb of NH₃ = 4.75, log 2 = 0.301, log 3 = 0.477, Kw = 1.0 × 10⁻¹⁴)

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