If the $pH$ of pure water is $6.5$ , then its temperature should be more than $293 K$ .

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Solution

Effect of temperature on $pH$ :-
Temperature causes an increase in ionisation.
Thus, as the temperature rises, the amount of $H^{+}$ active in the solution will also rise and the $pH$ should fall (means acidic $pH < 7$ ).
Normal assumptions assume that the temperature has increased from room temperature ( $293 K$ ) when neutral water's $pH$ decreases (neutral water $pH = 7$ ).
Consequently, the temperature should be higher than $298 K$ when the pH of water is $6.5$ .

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If the pH of pure water is 6.5, then its temperature should be more than 293K.

If the $pH$ of pure water is $6.5$ , then its temperature should be more than $293 K$ .