Question

The pH of a neutral water is $6.5$. Then the temperature of water:

• A. Is ${25}^{o}C$
• B. Is more than ${25}^{o}C$
• C. Is less than ${25}^{o}C$
• D. Can be more or less than ${25}^{o}C$
• E. Cannot be predicted

Answer 1

Answer: (B)

Is more than ${25}^{o}C$

The ionization increases with temperature. So the amount of $H^{+}$ active in solution will increase with temperature, the pH should decrease.

When there is decrease in pH of neutral water, it is normally assumed that the temperature is increased from room temperature ${25}^{0}C.$

So when the pH of neutral water is 6.5, the temperature should greater than ${25}^{0}C.$