MCQ
The $pOH$ at which water is maximum dissociated at $25\,^oC,$ is
- A$14$
- ✓$7$
- C$0$
- DNone of these
✓
Answer
Correct option: B.
$7$
b
At $25^{\circ} C$
At $25^{\circ} C$
$\quad\quad\quad\quad H _2 O == CH ^{+}+{ }^{-} OH$
At $pOH\quad\,7 \quad\quad\quad 10^{-7} \quad\quad 10^{-7}$
If $pOH =14 \rightarrow$ solution is highly basic, the conc. of $- OH$ will be very high and due to common ion effect, the reaction goes back ward and $\alpha$ will decrease.
If $pOH =0 \rightarrow$ solution is highly aicidic, the concentration of $H ^{+}$ will be very high and due to common ion effect, the reaction moves in back ward direction.
$\therefore \quad$ At $pOH =7$, maximum dissociation.
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