Temperature Dependence of Kw

The value of $K_w$ is constant at $1.0 \times 10^{-14}$ regardless of temperature.

Temperature affects the degree of water autoionization, thereby altering the concentrations of $[H^+]$ and $[OH^-]$.

At temperatures above 25°C, $K_w$ increases, which can change the neutral pH value.

For example, at higher temperatures, both $[H^+]$ and $[OH^-]$ concentrations can increase while maintaining $[H^+][OH^-] = K_w$.