## Chemistry: The Molecular Science (5th Edition)

Acid: $H_2{PO_4}^-$; Its conjugate base: $HP{O_4}^{2-}$ Acid: $H_2$; Its conjugate base: $H^-$ Acid: $HS{O_3}^-$; Its conjugate base: $S{O_3}^{2-}$ Acid: $HF$; Its conjugate base: $F^-$ Base: $P{O_4}^{3-}$; Its conjugate acid: $HP{O_4}^{2-}$ Base: $N{H_2}^-$; Its conjugate acid: $NH_3$ Base: $Cl{O_4}^-$; Its conjugate acid: $HClO_4$ Base: $Br^-$; Its conjugate acid: $HBr$
- These are conjugate acid-base pairs, so: 1. To go from acid to conjugate base (Or conjugate acid to base): Remove one $(H^+)$; - Remove one hydrogen, and subtract one from the charge: Examples: $H_2P{O_4}^- --\gt HP{O_4}^- -- \gt HP{O_4}^{2-}$ $HBr --\gt Br --\gt Br^-$ 2. To go from base to conjugate acid (Or conjugate base to acid): Add one $(H^+)$; - Add one hydrogen, and sum one to the charge: Examples: $H^- --\gt {H_2}^- --\gt H_2$ $Cl{O_4}^- --\gt HCl{O_4}^- --\gt HClO_4$