Question

The hydroxide ion concentration of a solution is$1.0\times {10}^{-8}M$. The $pH$ of the solution is:

• A. 5
• B. 8
• C. 6
• D. none of these

Answer 1

The correct option is C 6

$\left[O{H}^{-}\right]={10}^{-8}$

but, $\left[H^{+}\right]\left[O{H}^{-}\right]=kW$

So, $pH+pOH=pkW$

$pOH=-\log \left[{10}^{-8}\right]=8$

$pH+pOH=14$

$\therefore pH=6$