At 50 °C the value of pKw for water is 13.60. A laboratory technician dilutes 40.0 mL of 1.50 M NaOH with distilled water to a final volume of 2.00 L and stores the solution at 50 °C. What is the pH of the solution at this temperature?
a) 1.52
b) 13.08
c) 12.08
d) 12.48