1.0 L buffer solution is prepared by mixing 0.075 M of NH₄Cl, with 0.050 M of NH₃ solution. Calculate the pH when 1.0 mL of 1.0 M of HCl is added to the buffer solution. Assume that the volume of the solution does not change when HCl is added. [Kb for NH₃ = 1.8 x 10⁻⁵]
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