During the step-wise titration of the polyprotic acid with aqueous , distinct buffer regions are established prior to each equivalence point. Which of the following conjugate acid-base pairs constitut

Question

During the step-wise titration of the polyprotic acid $H_3PO_4$ with aqueous $NaOH$, distinct buffer regions are established prior to each equivalence point. Which of the following conjugate acid-base pairs constitute these viable buffer regions?

Prashant Kotian · Accepted Answer

Correct answer: A,B,C. neutralizes in three separate stages corresponding to its three ionizable protons. In the first stage, the buffer pair is . In the second stage, the pair is . In the third stage, it is . Option D is physically incorrect as the species differ by two protons and do not form a simple conjugate buffer pair.

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