Question

Calculate pH value of $0.0001N$ $NaOH$ solution?

Answer 1

For NaOH, normality is equal to molarity.

$\left[O{H}^{-}\right]=\left[NaOH\right]=0.0001N=0.0001M$

$pOH=-log\left[O{H}^{-}\right]=-log0.0001=4$
$pH=14-pOH=14-4=10$.