Sodium Hydroxide Is Added to a 0

question 4

Multiple Choice

Sodium hydroxide is added to a 0.1 M solution of phenylalanine.Phenylalanine is a diprotic acid with two pK_as,2.20 for the carboxylic acid group and 9.31 for the ammonium functional group.When the pH = 5.93,the principal species is____________________ and when the pH = 10.10,the principal species is____________________ .

• A)H₂L⁺;H₂L⁺
• B)HL;L⁻
• C)H₂L⁺;L⁻
• D)H₂L⁺;HL
• E)HL;HL

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