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  4. One litre of a buffer solution containing 0.01 M NH 4 Cl and 0.1 M NH 4 OH having p Kb of 5 has pH of

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Q. One litre of a buffer solution containing $0.01 \,M \,NH _{4} Cl$ and $0.1\, M \,NH _{4} OH$ having $p K_{b}$ of $5$ has $pH$ of

Equilibrium

Solution:

Given,
conc. of $NH _{4} OH =0.1 M$
conc. of $NH _{4} Cl =0.01 M$
$p K_{b}=5$
$\because pOH = p K_{b}+\log \frac{[\text { salt }]}{[\text { base }]}$
$=5+\log \frac{0.01}{0.1}=5+\log 10^{-1}$
$=5-1=4$
$\therefore pH =14-4=10$