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Alanine is an amphoteric substance: both acidic and basic at the same time.

However, it is neutral in a pH = 6.1 solution: CH3CH(NH3+)COO-

It is positvely charged ( by excess of H+) at lower pH sol'n CH3CH(NH3+)COOH and negatively in pure water or more basic solution CH3CH(NH2)COO-.

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14y ago

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