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 0.0500 M solution of alanine after 25.00 mL of 0.100 M NaOH has been added?

A) 2) 34
B) 4) 85
C) 5) 59
D) 6) 72