Question

The $pH$ of pure water at $90{}^{°}C$ will be

• A. less than $7$
• B. more than $7$
• C. equal to $7$
• D. cannot be predicted

Answer 1

Answer: (A)

At $298K$, $pH$ of water is $7$. At higher temperature, $H_{2}O$ dissociates more to give larger concentration of $H^{+}$ ions. $pH$ will be less than $7$