Write the equations for successive dissociation of phosphoric acid. Explain the variation in the magnitude of successive dissociation constants?
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H3PO4 + H2O --------> H3O+ + H2PO4-
H2PO4- + H2O ----------> H3O+ + (HPO4)2-
(HPO4)2- + H2O --------> H3O+ + (PO4)3-
H2PO4- + H2O ----------> H3O+ + (HPO4)2-
(HPO4)2- + H2O --------> H3O+ + (PO4)3-
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