Phosphoric acid ionizes in three sequential steps: (1) (2) (3) List every distinct…

CHEMISTRY · Subjective · A Level · Chemistry · Acids and bases · Acids and bases

Problem

Phosphoric acid ionizes in three sequential steps: (1) H3PO4+H2O⇌H2PO4−+H3O+H_3PO_4+H_2O\rightleftharpoons H_2PO_4^-+H_3O^+ (2) H2PO4−+H2O⇌HPO42−+H3O+H_2PO_4^-+H_2O\rightleftharpoons HPO_4^{2-}+H_3O^+ (3) HPO42−+H2O⇌PO43−+H3O+HPO_4^{2-}+H_2O\rightleftharpoons PO_4^{3-}+H_3O^+ List every distinct conjugate acid–base pair that appears across these three equilibria.

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