Question

A solution having hydrogen ion concentration is $0.0005g$ eqvt/litre, its $pOH$ is ___________.

• A. $8.2798$
• B. $10.6990$
• C. $12.7854$
• D. $13.3344$

Answer 1

Answer: (B)

$10.6990$

As we know, $pH=-\log \left[H^{+}\right]=-\log [5\times {10}^{-4}]$

$4-\log 5=4-[\log 10-\log 2]$

$=3+\log 2=3.3010$

$pOH=14-pH=14-3.3=10.7$