QJEEM25Ch064a: JEE Main 2025 Chemistry - Class 11 JEEM25Ch064a Solution: pH of water is 7 at . If water is heated to ., it's pH will :

Question

Verified Solution • 2025–26 Session moderate

pH of water is 7 at $25^{\circ} \mathrm{C}$ . If water is heated to $80^{\circ} \mathrm{C}$ ., it's pH will :

A Decrease
B Remains the same
C Increase
D $\mathrm{H}^{+}$ concentration increases, $\mathrm{OH}^{-}$ concentration decreases

Accepted Answer

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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