ACIDIC medium ZWITTER ion convert into \[\overset{+}{\mathop{N}}\,{{H}_{3}}-\underset{R}{\mathop{\underset{|}{\mathop{C}}\,}}\,H-CO{{O}^{-}}+{{H}^{+}}\] \[\xrightarrow{{}}\overset{+}{\mathop{N}}\,{{H}_{3}}-\underset{R}{\mathop{\underset{|}{\mathop{C}}\,}}\,H-COOH\]