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Q.

pH of water is 7 at 25°C. If water is heated to 80°C, it’s pH will :

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a

Increase

b

H+ concentration increases, OH– concentration decreases

c

Remains the same

d

Decrease

answer is A.

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Detailed Solution

With increase in temperature, Kw of water increases So, degree of dissociation of water increase
∴ pH as well as pOH of water decrease.

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pH of water is 7 at 25°C. If water is heated to 80°C, it’s pH will :