First slide

Ionic product of water

Question

Statement 1 : The pH of pure water is less than 7 at $60^{0} C .$
Statement 2 : As the temperature increases, pure water becomes slightly acidic.

Easy

A

Both statements I and II are correct.
B

Statement I is correct and statement II is incorrect.
C

Statement I is incorrect and statement II is correct.
D

Both statements I and II are incorrect.

Solution

The scale of pH (0 to 14 at $25^{0} C)$ changes to (0 to < 14) as the temperature rises because $K_{w}$ of water increases with temperature. Note that $[H^{+}] [{OH}^{-}]$ and thus water remains neutral.

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