Near a PH of 5

question 9

Multiple Choice

Near a pH of 5.5,L-lysine (R = −(CH₂) ₄NH₂) the major species in aqueous solution is the diprotonated zwitterion.Given the following acid dissociation constants,what is the correct structure of the zwitterion?
Functional Group
K_a
Carboxylic acid
1) 7 x10^-2
Amine
8) 5 x10^-10
Side chain amine
1) 51 x10^-11

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