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  1. D

    Why amino acids as Zwitterons in solid state and ph neutral?

    The carboxyl group on an amino acid generally has a pKa of around 2, while the amino group has a pKa around 9. Remember, when pH=pKa, the ionizable group exists half in its protonated form, and half in its deprotonated form. The deprotonated form of the carboxyl group is COO-; the deprotonated...