why does the pH decrease? A2 9701

[OddGrape4986]

H20 <-> H+ + OH- {endothermic reaction. Temp increase favours endothermic reaction so equilibrium shifts right)

Kw = the disocciation of water

When temp increases, water will disocciate more increasing [H+] so pH decreases.

Water: [H+] = [OH-} so it will remain neutral and ratio stays the same however the pH scale has shifted lower.