Chemistry - Ionic Equilibrium Question with Solution | TestHub

The autoionization of water ($2H_{2}O\rightleftharpoons H_3{O}^{+}+O{H}^{-}$) is an endothermic process. Increasing temperature shifts the equilibrium to the right, increasing $[H_3{O}^{+}]$ and $[O{H}^{-}]$. This decreases both pH and pOH, but water remains neutral as $[H_3{O}^{+}]=[O{H}^{-}]$. Therefore, water does not become more acidic.