One of the buffers listed in Table IV is glycine and is an amino acid. As mentio

Question

One of the buffers listed in Table IV is glycine and is an amino acid. As mentioned in class, all amino acid have 4 substituents on a central (chiral) carbon: Amino group, carboxyl group, hydrogen, and an R group. For glycine, the R group is a hydrogen atom (not a real R group). How come glycine has two pKa values? Because its central carbon works as a buffer Because glycine has two hydrogens attached to its central carbon, each hydrogen has different pKa values. Because its carboxyl group works as a weak acid and releases its proton at low pH, and its amino group releases its proton at high pH. Because its carboxyl group has several protons that can be dissociated at different pH. Because its amino group has several protons that can be dissociated at different pH.

Explanation / Answer

it has 2 pKa groups since:

amino gropu = basic, i.e. NH2 + NH3+

carboxyil group = acidic, i.e. COOH and COO- and H+

chosoe the THIRD option

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