Phosphoric acid (H3PO4) is a weak triprotic acid, meaning it can donate three protons (H+) and it will have three equilibrium reactions.
Removing one H+ per step in H3PO4:
What is the hydrolysis reaction associated with Ka2 for phosphoric acid, H3PO4?
A. H3PO4(aq) + H2O(l) ⇌ H2PO4-(aq) + H3O+(aq)
B. H2PO4-(aq) + H2O(l) ⇌ HPO42-(aq) + H3O+(aq)
C. HPO42-(aq) + H2O(l) ⇌ PO43−(aq) + H3O+(aq)
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