7.39 The species: H2O, HCO3, HSO4 and NH3 can act both as Brönsted acids and bases. For each case give the corresponding conjugate acid and base.

The table below lists the conjugate acids and conjugate bases for the given species.
Species Conjugate acid Conjugate base

H2O        H3O+      OH-HCO3     -  H2CO3    CO32-HSO4-    H2SO4      SO42-NH3        NH4+           NH2-