Question

The pOH value of a solution whose hydroxide ion concentration is $6.2 \times 10^{-9}$ mol/litre is

• A. 8.21
• B. 6.21
• C. 7.75
• D. 7.21

Answer 1

Answer: (A)

8.21

Answer 2

$- \log (OH) = pOH; - \log \,6.2 \times 10^{-9} = pOH;$
$\therefore \, pOH = 8.21$