Acid-Base Titrations

AP Chemistry· difficulty 4/5

The titration curve of a diprotic acid H2A vs NaOH shows two equivalence points.

Which species predominates between the two equivalence points (after eq 1, before eq 2)?

Explanation

The first equivalence point converts H2A to HA-; further base then converts HA- to A2-. Between the two, the dominant species is the amphiprotic HA-.

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