At 50°C, the lion-product constant for H2O has the value Kw = 5.48×10^-14. (a) what is the pH of pure water at 50°C

At 50 °C, the ion-product constant for H₂O has the value K_w = 5.48 × 10^-14. (a) What is the pH of pure water at 50 °C? (b) Based on the change in K_w with temperature, predict whether ∆H is positive, negative, or zero for the autoionization reaction of water:

2 H₂O(l) H₃O⁺(aq) + OH^-(aq)

b) K_w increases with the increasing temperature. The autoionization of water is endothermic process, ∆H is positive.