MCQ
A $0.1\,N $ solution of an acid at room temperature has a degree of ionisation $ 0.1$ . The concentration of $O{H^ - }$ would be
- ✓${10^{ - 12}}\,M$
- B${10^{ - 11}}\,M$
- C${10^{ - 9}}\,M$
- D${10^{ - 2}}\,M$
✓
Answer
Correct option: A.
${10^{ - 12}}\,M$
(a) $[{H^ + }] = C \times \alpha = 0.1 \times 0.1 = {10^{ - 2}}\,M$
$pH = 2; pOH = 12 $ ; $[O{H^ - }] = {10^{ - 12}}\,M$.
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