# Can we manipulate the rate of water's autoionization?

I just got introduced to this concept and these thoughts came into my mind. Is there a way to increase the equilibrium constant of the autoionization of water?

• Are you talking about the rate (kinetics) or the equilibrium position (thermodynamics)? – orthocresol Jun 9 '18 at 11:46
• Heat it. Autodissociation is an endohermic reaction. – Oscar Lanzi Jun 9 '18 at 11:48
• As a follow on from @Oscar Lanzi, supercritical water can start to pit/corrode steel due to the increased ionisation causing increased acidity. – Beerhunter Jun 10 '18 at 19:11

To find out how much increasing the temperature of water will affect $K_w$, the Arrhenius equation will work for values of $T$ close to $0 °C$. $K_w=Ae^{\frac{-E_a}{RT}}$.
Of course, you'll have to find $A$ from experimental data.
Here is a graph of how changing the temperature affects $pK_w$. For the most part, as temperature increases, you will see an increase in K.