One litre buffer solution was prepared by| IONIC EQUILIBRIUM

JEE MAIN 2025

07.04.25 S2

Question

One litre buffer solution was prepared by adding 0.10 mol each of and in deionised water. The change in pH on addition of 0.05 mol of HCl to the above solution is _____ . (Nearest integer)

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Solution

$\begin{aligned} & \mathrm{pOH}=\mathrm{pK}_{\mathrm{b}}+\log \frac{\left[\mathrm{NH}_4^{+}\right]}{\left[\mathrm{NH}_3\right]} \\ & \mathrm{pOH}=4.745 \\ & \text { on adding } 0.05 \mathrm{moleHCl} \\ & \mathrm{NH}_3+\mathrm{H}^{\oplus} \rightarrow \mathrm{NH}_4^{\oplus} \\ & 0.1 \\ & 0.05 \quad 0.05 \quad 0.1 \\ & \mathrm{pOH}=4.745+\log 3 \\ & \mathrm{pOH}-\mathrm{pOH}=0.477 \\ & 14-\mathrm{pH}-14+\mathrm{pH}=0.477 \\ & \Delta \mathrm{pH}=0.477 \\ & =47.7 \times 10^{-2} \approx 48 \times 10^{-2}\end{aligned}$

Question Tags

JEE Main

Chemistry

Medium

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