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  4. Ka of CH3COOH is 1.8× 10- 5 and Kb of NH4OH is 1.8× 10- 5 . The pH of amonium acetate is ?

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Q. $K_{a}$ of $CH_{3}COOH$ is $1.8\times 10^{- 5}$ and $K_{b}$ of $NH_{4}OH$ is $1.8\times 10^{- 5}$ . The $pH$ of amonium acetate is ?

NTA AbhyasNTA Abhyas 2020

Solution:

$CH_{3}COONH_{4}$ is $W.A-W.B$
Type salt than $pH=7+\frac{1}{2}pK_{a}-\frac{1}{2}pK_{b}$