Solid NaOH Is Added to 1 L of an Isoleucine

question 20

Multiple Choice

Solid NaOH is added to 1 L of an isoleucine solution,H₂L⁺,i.e,100 mM.When 175 mmol of NaOH is added,the principal species is____________________ .The pKa for the carboxylic acid group is 2.318 and the pKa for the ammonium group is 9.758.Assume the isoleucine solution volume does not change appreciably.

• A)H₂L⁺
• B)L⁻
• C)HL
• D)H₃L²⁺
• E)L²⁻

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