MCQ
If $0.4\,gm\,\,NaOH$ is present in $ 1$ litre solution, then its $pH$ will be
- A$2$
- B$10$
- C$11$
- ✓$12$
✓
Answer
Correct option: D.
$12$
(d) $[NaOH] = \frac{{0.4}}{{40}} = 0.01\,M;\,\,\,\,\,[O{H^ - }] = {10^{ - 2}}\,M$
$[{H^ + }] = {10^{ - 12}},\,\,pH = - \log [{H^ + }] = 12$
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