Question

At a particular temperature under high pressure $K_w\left(H_{2}O\right)=1\times {10}^{-10}$
A solution of $pH=5.4$ under these conditions is said to be:

• A. Acidic
• B. Basic
• C. Neutral
• D. Amphoteric

Answer 1

The correct option is B Basic

$K_w=1\times {10}^{-10}$
$\therefore \left[H^{+}\right]=\left[O{H}^{-}\right]={10}^{-5}\text{M}$
Thus $pH=5$ for a neutral solution
$pH<5$ acidic, $pH>5$ basic.