pH of water is 7.0 at 25° C . If water is heated to 70° C , then:-

Question

pH of water is 7.0 at 25° C . If water is heated to 70° C , then:- (A) pH will decrease and solution becomes acidic (B) pH will increase (C) pH will remain constant as 7 (D) pH will decrease but solution will be neutral

Tardigrade Admin · Accepted Answer

On heating water Kw increases and thus pH , scale for neutrality changes from 7 to some lower values i.e. 6.8 or 6.9 depending upon Kw values.

Q. $p H$ of water is $7.0$ at $2 5^{\circ} C$ . If water is heated to $7 0^{\circ} C$ , then:-

$p H$ will decrease and solution becomes acidic

$p H$ will increase

$p H$ will remain constant as $7$

$p H$ will decrease but solution will be neutral

On heating water $K_{w}$ increases and thus $p H$ , scale for neutrality changes from $7$ to some lower values i.e. $6.8$ or $6.9$ depending upon $K_{w}$ values.

Q. pH of water is 7.0 at 25∘C . If water is heated to 70∘C , then:-

pH will decrease and solution becomes acidic

pH will increase

pH will remain constant as 7

pH will decrease but solution will be neutral