Write the structure of alanine at pH = 2 and pH = 10.

Explanation

Alanine exists as a zwitterison (I) in aqueous solution. In presence of acid `(pH=2)`, the basic `-COO^(-)` group accepts a proton to give cation (II) but in presence of a base `(pH=10)`, the acidie `-overset(N)H_(3)` group donates a proton to the base and thus exists as an anion (III).