The amino acid L-histidine (L-His) has a side chain with a functional group called an imidazole, which in its protonated form has a pKa of 6.9. Draw its four different ionization states in water at the pH values indicated. Write the total charge on the molecule in the box at the bottom. pH = 8 is done for you. pH = 0 pH = 4 pH = 8 pH =12 +H3N. N= 0 NH

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The amino acid L-histidine (L-His) has a side chain with a functional group called an imidazole,
which in its protonated form has a pK₂ of 6.9. Draw its four different ionization states in water at
the pH values indicated. Write the total charge on the molecule in the box at the bottom. pH = 8
is done for you.
pH = 0
pH = 4
pH = 8
pH =12
+H3N.
요.
N=
0
ΝΗ
Transcribed Image Text:The amino acid L-histidine (L-His) has a side chain with a functional group called an imidazole, which in its protonated form has a pK₂ of 6.9. Draw its four different ionization states in water at the pH values indicated. Write the total charge on the molecule in the box at the bottom. pH = 8 is done for you. pH = 0 pH = 4 pH = 8 pH =12 +H3N. 요. N= 0 ΝΗ
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