The acid-base theory defines an acid as an acid is a proton (H+) donor.
What does Lewis' theory say?
Lewis' acid-base theory approaches the concept of acids and bases from the donation or receipt of electron pairs. In 1923, the American physical chemist Gilbert Newton Lewis developed his acid-base theory, which is quite effective in classifying a group into an acid or a base.
The Arrhenius acid-base theory says that the acid releases only the hydrogen as a cation in water and the base releases the hydroxyl as an anion.
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