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Typically amino acids can exist in three states, as far as I’m aware, which depend on the pH: Three States: However, most of the time I see amino acids in a completely uncharged state when shown in textbooks or on the internet: enter image description here

The issue is, I cannot seem to think of any possible pH where such a state can exist. Please correct me if I’m wrong on this and tell me under what conditions such a state can occur. However, if I’m right then why do they show it as such… for simplicity?

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    $\begingroup$ That may occur uncharged in pure form or dissolved in polar aprotic solvents, not in water, where such form exist in trace equilibrium concentrations. $\endgroup$
    – Poutnik
    Commented Dec 20, 2022 at 9:23
  • $\begingroup$ If I had a button to turn comments into answers… $\endgroup$
    – Karsten ♦
    Commented Dec 20, 2022 at 13:20
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    $\begingroup$ @Karsten Kinda did that for you ;) Duping is close enough for me. $\endgroup$
    – Mithoron
    Commented Dec 20, 2022 at 20:43

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