Alanine has p Ka values of 2.34 and 9.69 . Therefore,...

Alanine has $\mathrm{p} K_{\mathrm{a}}$ values of 2.34 and $9.69 .$ Therefore, alanine exists predominately as a zwitterion in an aqueous solution with $\mathrm{pH}>$ ______ and $\mathrm{pH}<$ ______.

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Key Concepts

pKa

pKa values indicate the pH at which an ionizable group is 50% protonated and 50% deprotonated. They are crucial for understanding the acid-base properties of molecules, particularly in amino acids where different functional groups have distinct pKa values.

Amino Acid Structure

Amino acids have both an amino group and a carboxyl group attached to the same carbon. This dual functionality allows them to act as either acids or bases depending on the pH of the solution, leading to specific protonation states for each group.

Zwitterion

A zwitterion is a molecule that contains both positive and negative charges simultaneously, yet has an overall neutral charge. For amino acids, this occurs when the amino group is protonated and the carboxyl group is deprotonated, primarily within a specific pH range.

Isoelectric Point

The isoelectric point (pI) is the pH at which an amino acid has no net electrical charge. It is typically calculated as the average of the relevant pKa values and corresponds to the pH range in which the amino acid predominantly exists as a zwitterion.

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