The pH of neutral water at 25°C is 7.0. As the temperature increases, ionisation of water increases, however, the concentration of H+ ions and OH- ions are equal. What will be the pH of pure water at 60°C?

(i) Equal to 7.0

(ii) Greater than 7.0

(iii) Less than 7.0

(iv) Equal to zero

Answers (1)

The answer is the option (iii) Less than 7.0

Explanation:  Kw increases [H+ ][OH- ]>10^{-14}

As [H+ ]=[OH- ]

or [H+ ]^{2} =10^{-14}

or [H+ ]>10^{-7} M

pH< 7

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