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  4. What will be the pH of 0.1 M ammonium acetate solution? (p Ka=p Kb=4.74)

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Q. What will be the $pH$ of $0.1\, M$ ammonium acetate solution? $\left(p K_{a}=p K_{b}=4.74\right)$

AMUAMU 2015Equilibrium

Solution:

Ammonium acetate $\left( CH _{3} COONH _{4}\right)$ is a salt of weak acid and weak base.
$p H=7+\frac{1}{2}\left(p K_{a}-p K_{b}\right)$
Given that, $p K_{a}=p K_{b}=4.74$
Putting that values, we get
$p H=7+\frac{1}{2}(4.74-4.74)=7+0=7$