Evidence of Zwitterion in Amino Acids at Neutral pH N H3 + CH2 C O￾O CH3COOH CH3CH2N H2 CH3 C O￾CH3 CH2 NH3 + O 1. At Neutral pH CH3CH2COOH CH3 CH CH3 NH2 CH3 CH C O - NH3 + O Melting Point -101 C 295 C 22 C 2.Evidence of Zwitterion in Amino Acids at Neutral pH N H3 + CH2 C O￾O CH3COOH CH3CH2N H2 CH3 C O￾CH3 CH2 NH3 + O 1. At Neutral pH CH3CH2COOH CH3 CH CH3 NH2 CH3 CH C O - NH3 + O Melting Point -101 C 295 C 22 C 2