Question

The $pH$ value of $1\times 10^{-4}MNaOH$ solution is

• A. 4
• B. 10
• C. 6
• D. between 6-7

Answer 1

Answer: (B)

$1\times 10^{-4}MNaOH=1\times 10^{-4}M\left[O{H}^{-}\right]$
$pOH=-\log \left[O{H}^{-}\right]=-\log \left(1\times 10^{-4}\right)=4$
$pH=14-pOH=14-4=10$