Physical Properties Amphoteric Compounds

A common characteristic of amino acids is to have a dipolar ion (Zwitterion) in molecular form—not an uncharged form of H2N-CHR-COOH but a dipolar ion, H3N+-CHR-COO~—in both neutral solution and in solid state.

Generally, this is recognized by the following physical properties. Amino acids have (1) high melting points; (2) high dipole moments; (3) extremely low volatile characters; and (4) in solution, changes in the value of the dielectric constant of water and electrical strain are determined directly by Raman spectra and infrared spectra.

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