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Questions  >>  JEEMAIN and NEET  >>  Chemistry  >>  Equilibrium
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Q)

The pH of pure water at $80^\circ C$ will be

(a) > 7

(b) < 7

(c) = 7

(d)  cannot be predicted.

2 Answers

Comment
A)
Answer: < 7
 
The value of $K_w$ increases with rise in temperature because dissociation of water is endothermic.
$\therefore$ The value of pH of natural water decreases with rise in temperature.

 

 
Comment
A)
Temperature will have a measurable yet very slight effect on the pH of water. In fact, pure water has a pH of exactly 7 only at 25 degrees Celsius, or 77 degrees Fahrenheit. As the water temperature goes up, pH goes down.
Hence pH of water at $80^{\circ}$ is < 7.
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