The Dissociation Equilibrium Constants for the Protonated Form of Alanine

Multiple Choice

The dissociation equilibrium constants for the protonated form of alanine (a diprotic amino acid H₂X⁺) are K_a1 = 4.6 × 10^-3 and K_a2 = 2.0 × 10^-10.What is the pH of 50.00 mL of a 0.100 M solution of alanine after 100.00 mL of 0.100 M NaOH has been added?

A) 9.70
B) 10.69
C) 11.11
D) 12.70