Carbonic acid, H₂CO₃, is a diprotic acid with pKa1=6.35. A solution is prepared by combining 100.0 mL of 0.100 M H₂CO₃ with 25.0 mL of 0.200 M NaOH at 25 °C. Assume only the first ionization is significant. What is the pH of the final solution?
a) 6.65
b) 6.35
c) 6.05
d) 8.32