Polyprotic Acids and Bases

• Phosphoric Acid

  • H3PO4(aq) + H2O(l) ? H3O+(aq) + H2PO4-(aq) K=7.5e-3
  • H2PO4-(aq) + H2O(l) ? H3O+(aq) + HPO42-(aq) K=6.2e-8
  • HPO42-(aq) + H2O(l) ? H3O+(aq) + PO43-(aq) K=3.6e-13

• Compute the pH of a 0.10 M solution of H2PO4-

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