Answer :

Those acids which contain more than one H+ ion, they dissociate in stages. Phosphoric acid is also an example of such acid.

Dissociation of phosphoric acid takes place in following stages:


H3PO4 H+ + H2PO4


(Dihydrogen phosphate ion)


H2PO4 H+ + HPO42–


(Hydrogen phosphate ion)


HPO42– H+ + PO43–


(Phosphate ion)


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