Le Chatelier's Principle applied to endothermic equilibrium Steps:

• Forward reaction endothermic, so increasing temperature favors forward direction per Le Chatelier's Principle.
• Equilibrium shifts right, increasing [H+] and [OH-], thus raising Kw.
• In pure water, [H+] = [OH-] = √Kw, so both ion concentrations rise.
• pH = -log[H+]; higher [H+] means pH drops below 7. Not enough information: Changes 1, 2, and 3 not specified in question.

Final answer: Not enough information.