Question

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 Ka
carboxylic acid
1.7 x10-2
amine
8.5 x10-10
side chain amine
1.51 x10-11

A)

B)

C)

D)

E)

Answer

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