Polyprotic Acids ·
Stepwise pKa
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.com · H₃PO₄ · 2.15 · 7.20 · 12.35
Species
H₃PO₄
pKa
—
Stage
one acid, three protons
H₃PO₄ (neutral)
H₂PO₄⁻ / HPO₄²⁻
Released H⁺
Buffer plateau
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.com · Polyprotic Acids