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1. Asociati fiecarui acid din sirul A baza lui conjugata din sirul B.
[tex]A: ~HCl, ~NH_4^+ , ~HCO_3^-,~H_2SO_4, ~H_3O^+[/tex]
[tex]B:~CO_3~^{2-},~NH_3, ~Cl^-,~HSO_4^-,~H_2O [/tex]

2.Stabiliti cuplurile acid-baza conjugata in urmatoarele reacrii reversibile:
[tex]HCO_3^-~+~HO^-~\rightleftharpoons~CO_2~^{2-}~+~H_2O[/tex]
[tex]CH_3COOH+H_2O\rightleftharpoons CH_3COO^-~+~H_3O^+[/tex]
[tex]NH_4~^+~+~H_2O~\rightleftharpoons~NH_3+H_3O^+[/tex]