Solid KOH (M = 56.11, ∆H°soln = –57.6 kJ mol-1) is slowly added to distilled water contained in a we — Thermochemistry Chemistry Question

Solid KOH (M = 56.11, ∆H°soln = –57.6 kJ mol^-1) is slowly added to distilled water contained in a well-insulated vessel, initially at 25.0 °C. What is the pH when the temperature of the solution reaches 26.0 °C? You may assume that the density of the solution remains at 1.00 g mL^-1 and its heat capacity remains at 4.184 J g^-1 K^-1 throughout the experiment.