The pH of water is 7 at 25^{circ} C. If water | vedclass

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(A) The auto-ionization of water is an endothermic process: $H_2O(l) \rightleftharpoons H^+(aq) + OH^-(aq)$.As temperature increases,the equilibrium c

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(A) The auto-ionization of water is an endothermic process: $H_2O(l) \rightleftharpoons H^+(aq) + OH^-(aq)$.As temperature increases,the equilibrium constant $K_W$ increases according to Le Chatelier's principle.Since $K_W = [H^+][OH^-]$ and at neutrality $[H^+] = [OH^-] = \sqrt{K_W}$,the concentration of $H^+$ ions increases.Therefore,$pH = -\log[H^+]$ decreases as the temperature rises.

The $pH$ of water is $7$ at $25^{\circ} C$. If water is heated to $80^{\circ} C$,its $pH$ will:

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