Question

$p{K}_a$ of a weak acid is $5.76$ and $p{K}_b$ of a weak base is $5.25$. What will be the $pH$ of the salt formed by the two?

• A. $7.255$
• B. $7.005$
• C. $10.225$
• D. $4.255$

Answer 1

Answer: (A)

$pH=\frac{1}{2}\left[p{K}_w+p{K}_a-p{K}_b\right]$
$pH=7+\frac{1}{2}\left(5.76-5.25\right)$
$=7.255$