Ionic Equilibrium Question 1

Question 1 - 2024 (01 Feb Shift 1)

$K _a$ for $CH _3 COOH$ is $1.8 \times 10^{-5}$ and $K _b$ for $NH _4 OH$ is $1.8 \times 10^{-5}$. The $pH$ of ammonium acetate solution will be

Show Answer

Answer (7)

Solution

$pH=\frac{pK _w+pK _a-pK _b}{2}$

$pK _a=pK _b$

$\Rightarrow pH=\frac{pK _w}{2}=7$