JEE MAIN - Chemistry (2025 - 23rd January Evening Shift - No. 1)
pH of water is 7 at $25^{\circ} \mathrm{C}$. If water is heated to $80^{\circ} \mathrm{C}$., it's pH will :
Decrease
Remains the same
Increase
$\mathrm{H}^{+}$concentration increases, $\mathrm{OH}^{-}$concentration decreases
Explanation
With increase in temperature, $\mathrm{K}_{\mathrm{w}}$ of water increases
So, degree of dissociation of water increase
$\therefore \mathrm{pH}$ as well as pOH of water decrease.
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