The Dissociation Equilibrium Constants for the Protonated Form of Alanine

question 97

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 0.050 M solution of alanine after 37.50 mL of 0.100 M NaOH has been added?

• A)4.85
• B)6.02
• C)7.39
• D)9.70

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