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Solution: Phosphoric acid (H3PO4) is characterized by three reactions ...

Question

Phosphoric acid (H3PO4) is characterized by three reactions for stepwise dissociation. Arrange the following species in the order of decreasing concentration in an aqueous solution of H3PO4. Clearly indicate the order of concentration change. JUSTIFY your answer.

H3PO4          H 2PO4-          HPO 42-          PO 43-          H 3O+