The $K_a$ and $K_b$ values of a-amino acids are very low. Why?
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In a-amino acids the acidic group is $-^+NH3,$ instead of $-COOH$ group as in carboxylic acids and basic group is $-COO-$ instead of $-NH_2$ group as in amines. That is why they have low values of $K_a$ and $K_b.$
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