Chemistry — Polyprotic Acids
Stepwise dissociation of a diprotic acid.
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\text{H}_2\text{A} \rightleftharpoons \text{H}^+ + \text{HA}^-,\quad K_{a1}
\text{HA}^- \rightleftharpoons \text{H}^+ + \text{A}^{2-},\quad K_{a2}
K_{a1} > K_{a2}
\text{multiple equivalence points}