Question

If 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. can be more or less than ${25}^{o}C$
• D. cannot be predicted

Answer 1

The correct option is B is more than ${25}^{o}C$

$pH$ of neutral water = 6.5
At ${25}^{o}C,$ the dissocation constant of water is ${10}^{-14},$ thus, pH of water at ${25}^{o}C$ would be taken to be 7.00. The pH of water gets lower with higher temperature, therefore, temperature is above ${25}^{o}C$