Glycine is the simplest of amino acids and is shown below.

Notice that it has a weak COOH end similar to acetic acid. Like acetic acid, this end is weakly acidic. It also has an NH₂ end similar to NH₃. Like NH₃, this end is weakly basic. Although not technically a buffer, when glycine is added to water, the solution is buffered against addition of strong acid or base. Explain why.

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H₂N CH₂ C O H the amino acid glycine