Using the Acid Dissociation Constants for Alanine (K_a1 = 5

question 18

Multiple Choice

Using the acid dissociation constants for alanine (K_a1 = 5.1 × 10−³ and K_a2 = 1.8 × 10−¹⁰) ,calculate the [Z]/[A−] ratio at pH 11.50.(Z = Zwitterion,A− = deprotonated anion)

• A) 6.2 × 10−¹⁰
• B) 5.1 × 101
• C) 1.8 × 10−²
• D) 4.6 × 10⁹
• E) 1.6 × 10⁹

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