MCQ
At certain temperature if $pK_w = 12.60$ then which is correct for an acidic solution
- A$[H^+] < 5 \times 10^{-7}\,M$
- B$[OH^-] = [H^+] = 5 \times 10^{-7}\,M$
- ✓$[OH^-] < 5 \times 10^{-7}\,M$
- D$[OH^-] > 5 \times 10^{-7}\,M$
✓
Answer
Correct option: C.
$[OH^-] < 5 \times 10^{-7}\,M$
c
$\left[\mathrm{H}^{+}\right][\mathrm{OH^-}]=10^{-12.6}$
$\left[\mathrm{H}^{+}\right][\mathrm{OH^-}]=10^{-12.6}$
For neutral solution $\left[\mathrm{H}^{+}\right]=\left[\mathrm{OH}^{-}\right]$
$\left[\mathrm{H}^{+}\right]^{2}=10^{-126}$
$\left[\mathrm{H}^{+}\right]=5 \times 10^{-7}$
For acidic solution $\left[\mathrm{H}^{+}\right]>5 \times 10^{-7}\, \mathrm{M}$ and
$[\mathrm{OH}]<5 \times 10^{-7} \,\mathrm{M}$
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