Classes of Bronsted Acids and Bases

Bronsted acids: (1) Monoprotic acids- donate one proton

                                                HF → H⁺ + F^-, CH₃COOH → CH₃COO^- + H⁺

                         (2) Polyprotic acids-donate two or more protons

                                                H₂S → 2H⁺ + S^2-, C₂O₄H₂ → C₂O₄^2- + 2H⁺

 

Bronsted bases: (1) Monoprotic bases- accept one proton

                                                HS^- + H⁺ → H₂S, H₂O + H⁺ → H₃O⁺

                         (2) Polyprotic bases- accept two or more protons

                                                SO4^2- + 2H⁺ → H₂SO₄, PO₄^3- + 3H⁺ → H₃PO₄⁺

Amphiprotic substances: Molecule or ions that behave both as Bronsted acid and base. For example, H₂O.