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Question
The pH of a weak monoacidic base is 11.2, and its OH– ion concentration is ______.
Options
1.585 × 10–3 mol dm–3
3.010 × 10–11 mol dm–3
3.010 × 10–3 mol dm–3
1.585 × 10–11 mol dm–3
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Solution
The pH of a weak monoacidic base is 11.2, its OH– ion concentration is 1.585 × 10–3 mol dm–3.
Explanation:
pOH of the solution is given as:
pOH = 14 – pH
= 14 – 11.2
= 2.8
pOH = – log10[OH–]
log10[OH–] = – pOH
= – 2.8
= – 2 – 0.8 – 1 + 1
= – 3 + 0.2
= `overline(3)`.2
[OH–] = antilog `overline(3)`.2 = 1.585 × 10–3 mol/dm–3
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