Question

The hydroxyl ion concentration of sodium hydroxide having a $pH$ value of 12 at ${25}^{o}C$ is:

• A. 0.00001
• B. 0.0001
• C. 0.001
• D. 0.01

Answer 1

The correct option is D 0.01

$pH+pOH=14$

$pOH=14-12=2$

$pOH=-log\left(\right[O{H}^{-}\left]\right)=2$

$\left[O{H}^{-}\right]={10}^{-2}=0.01M$