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  4. pH of solution at 25°C is 2. If the pH is to be then hydronium ion concentration should be

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Q. pH of solution at 25$^\circ$C is 2. If the pH is to be then hydronium ion concentration should be

Equilibrium

Solution:

$pH = 2$
$\therefore [H_{3}O^{+}]=10^{-2}$
This means, $[H^{+}]$ cone, should decrease from $10^{-2}$ to $10^{-4}$, i.e., by $100$ times