Question

Aqueous solutions of amino acids are buffered solutions. Why?

Short answer

Aqueous solutions of amino acids are buffered solutions. Because protein has both weak acid and weak base characteristics.

Step-by-step solution

Introduction of buffered solutions

Buffers are solutions that resist pH changes when acidic or basic components are added. It neutralizes small amounts of acid or base, thereby maintaining the pH of the solution. For processes or reactions requiring specific pH ranges, this is important.

To find why aqueous solutions of amino acids are buffered solutions

A buffer solution is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or weak base and its conjugate acid.

Since protein has both characteristics (it contains amino and carboxyl groups), it will act as a buffer when acid or base is added to the protein water solution.

Hence, because protein has both weak acid and weak base characteristics.