The Dissociation Equilibrium Constants for the Protonated Form of Alanine

question 196

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

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