At 50 °C, the ionic product of water is Kw=5.48×10−14. A technician mixes 100.0 mL of 0.0100 M HCl with 100.0 mL of 0.0105 M NaOH and allows the mixture to reach 50 °C. Which of the following is closest to the pH of the mixture?
a) 10.40
b) 7.00
c) 9.66
d) 9.96