I read this passage:
“It is important to emphasize that, while a strong acid/strong base titration will have its equivalence point had a pH of seven, the equivalence point does not always occur at pH 7. when titrating polyprotic acids or bases, there are multiple equivalence points, as each acidic or basic conjugate species is titrated separately.”
I want to make sure I understand what is being said. Only strong acid-strong base titrations have an equivalence point at a pH of 7, if a weak acid and/or weak base is involved (either as a titrant or titrand), that is not the case. Also for polyprotic compounds (as titrands?), there are multiple equivalence points, therefore the titration of a strong polyprotic acid or base won’t ONLY have an equivalence point at pH 7 (although it is possible to have one of the multiple equivalence points be at 7 but that would be a property of the compound, ie one of the pKas would be equal to 7).