Only litre buffer solution was prepared by adding 0.10 mol each of NH₃ and NH₄Cl in deionised water.
The change in pH on addition of 0.05 mol of HCl to the above solution is ____ × 10^–2, (Nearest integer)
(Given : pK_b of NH₃ = 4.745 and log₁₀3 = 0.477)