Hydrogen-containing ion names
Hydrogen-containing oxoanions:
Oxoanions may also have hydrogen bonded to one of the oxygen atoms.
These oxoanions can be thought of as arising
either from removal of H+ from the acids that have the formulae shown to the left of the arrow;
or from addition of H+ to the oxoanion shown to the right of the arrow.
or from addition of H+ to the oxoanion shown to the right of the arrow.
H2SO4 
HSO4– (hydrogensulfate ion) SO42– (sulfate)
H2CO3 HCO3– (hydrogencarbonate ion) CO32– carbonate)
H2SO3 HSO3– (hydrogensulfite ion) SO32– (sulfite)
HSO4– (hydrogensulfate ion) SO42– (sulfate)H2CO3
HCO3– (hydrogencarbonate ion) CO32– carbonate)H2SO3
HSO3– (hydrogensulfite ion) SO32– (sulfite)
Hydrogen-containing cations:
Two important polyatomic cations are derived from addition of H+ to the molecules H2O and NH3.
Note that both of these cations have an -ium ending.
NH3 (ammonia) NH4+ (ammonium)
H2O H3O+ (hydronium)
NH4+ (ammonium) H2O
H3O+ (hydronium)