MCQ
$pH$ of a solution is $ 5$ . Its hydroxyl ion concentration is
- A$5$
- B$10$
- C${10^{ - 5}}$
- ✓${10^{ - 9}}$
✓
Answer
Correct option: D.
${10^{ - 9}}$
(d) $pH = 5\,\,{\rm{means}}\,\,[{H^ + }] = {10^{ - 5}}$
$pOH = 14 - pH = 14 - 5 = 9$
$[O{H^ - }] = {10^{ - pOH}} = {10^{ - 9}}$
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