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Chem.Stud.
#3
Aug31-11, 06:32 AM
P: 27
There are several different definitions of acids. Brønsted being one guy who defined an acid as a substance that loses/gives/donates H+ (proton donor). Lewis is another one, and defines acid as a substance that is an electron-pair acceptor.

There probably are other definitions as well. And let's not forget the organic functional group
-COOH.