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What is the final pH if 0.02 mol HCl is added to 0.500 L of a 0.28 M NH3 and 0.22 M NH4Cl buffer solution? (Kb (NH3) = 1.8 ×10^-5) A) 4.64 B) 4.78 C) 9.36 D) 11.32 E) 9.22