HF (hydrofluoric acid) is a weak acid. SO4 2- (sulfite ion) is a weak base F- (fluoride anion) is a very weak base HSO4 - (hydrogen sulfate) is a weak acid
Conjugate acid of HF = H2F+ (dihydrogen fluoride) Conjugate base of HF = F- (fluoride)
Conjugate acid of SO4 2- = HSO4- (hydrogen sulfite) SO4 2- does not have a conjugate base because you can't take away any H+
Conjugate acid of F- = HF (hydrofluoric acid) F- does not have a conjugate base because you can't take away any H+
Conjugate acid of HSO4- = H2SO4 (sulphuric acid) Conjugate base of HSO4- = SO4 2- (sulfite)
In very simple words: Conjugate acid --> you add an H+ Conjugate base --> you take away an H+
