• # question_answer 92) The pH of pure water at $80{}^\circ C$ will be A)  =7                             B)  < 7C)  > 7               D)  None of these

Correct Answer: B

Solution :

The dissociation of water is an endothermic reaction therefore ${{K}_{W}}$(ionization) increases with the increase in temperature. The pH of pure water at $80{}^\circ C$ de- creases due to the rise in temperature and becomes less than 7 (due to increase in ${{H}^{+}}$concentration). Hence, the correct option is [b].

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