The Dissociation Equilibrium Constants for the Protonated Form of Alanine

question 162

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

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