MCQ
A base is dissolved in water yields a solution with a hydroxide ion concentration of $0.05$ $mol\,\,litr{e^{ - 1}}.$ The solution is
- ✓Basic
- BAcid
- CNeutral
- DBoth $(a) $ and $(b)$
✓
Answer
Correct option: A.
Basic
(a) $[O{H^ - }]$ion conc.$ = 0.05\frac{{mol}}{l}$ $ = 5 \times {10^{ - 2}}\frac{{mol}}{l}$
$pOH = - \log \,\,[O{H^ - }]$ $ = - \log \,\,[5 \times {10^{ - 2}}]$
$pOH = 1.30$; $pH + pOH = 14$
$pH = 14 - pOH $ $ = 14 - 1.30 = 12.7$
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