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Q.
$pH$ of water is $7.0$ at $25^\circ C$ . If water is heated to $70^\circ C$ , then:-
NTA AbhyasNTA Abhyas 2022
Solution:
On heating water $K_{w}$ increases and thus $pH$ , scale for neutrality changes from $7$ to some lower values i.e. $6.8$ or $6.9$ depending upon $K_{w}$ values.