Write the equation for the stepwise dissociation of phosphoric acid, name all the ions formed.

Phosphoric (orthophosphoric) acid H3PO4 is tribasic, respectively, there will be 3 dissociation stages:
1) H3PO4 ↔ H + + H2PO4- (hydride ion + dihydrogen phosphate ion)
2) H2PO4 – ↔ H + + HPO4 2- (hydride ion + hydrogen phosphate ion)
3) HPO4 2- ↔ H + + PO2 3- (hydride ion + orthophosphate ion)
Total: H3PO4 ↔ 3H + + PO4 3-

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