Chemistry — Kw and Temperature

K_w = [\text{H}^+][\text{OH}^-]

K_w = 10^{-14}\ \text{at } 25^\circ\text{C}

K_w \uparrow \text{ as } T \uparrow \text{ (endothermic)}

\text{neutral pH} < 7 \text{ when } T > 25^\circ\text{C}