Question

${10}^{-6}$ M NaOH is diluted 100 times. The pH of the diluted base is

• A. Between 5 and 6
• B. Between 6 and 7
• C. Between 10 and 11
• D. Between 7 and 8

Answer 1

The correct option is D Between 7 and 8

Total $O{H}^{\oplus }$ concentration
$={10}^{-8}+{10}^{-7}$
$=11\times {10}^{-8}$
$pOH=8-lo{g}^{11}$
$=6.96$
$pH=14-6.96$
$=7.04$