MCQ
The $pH$ of an aqueous solution having hydroxide ion concentration as $1 \times {10^{ - 5}}$ is
- A$5$
- ✓$9$
- C$4.5$
- D$11$
✓
Answer
Correct option: B.
$9$
(b) $[O{H^ - }] = 1 \times {10^{ - 5}}$
$pOH = - \log [O{H^ - }] = 5$
$pH + pOH = 14 \Rightarrow pH = 14 - 5 = 9$.
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