Sir, i want with explanation

Dear Siddhartha,

if take as whole compound of amino acid compared to pure and simple acids / amine, the acidity / basicity will be less compared to corboxylic acid / amine (as the compound forms zwitterion and the pH~ 7). if you want to compare acidity / basicity of the functional group compared to functional group of pure acids, the amino acid functional groups are stronger in acidity/ basicity.

because amino acid is having both proton donating group (-COOH) and proton taking/ attracting group(-NH2), it will transfer proton (in water solution), to form a stable zwitterion and the pH goes to about 7.

this is my idea about the acidity/basicity, sorry i am not a organic chemist.

Regards

Selvan

usually organic chemists will talk about acidity/bsicity of functional group ( theoretical pKa / practically derived pka of functional group) and

analytical chemists will talk about acidity / basicity of whole compound (practically measured pH of whole compound)

Http://chemed.chem.purdue.edu/genchem/topicreview/bp/1biochem/amino2.html