Will (HPO4)2- act as an acid or base in water? I know its amphoteric.
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Will (HPO4)2- act as an acid or base in water? I know its amphoteric.

[From: ] [author: ] [Date: 12-05-13] [Hit: ]
If the pH of the solution is neutral, the HPO4-- ion will take an H+ from the water (forming H2PO4-), leaving OH- ions behind.So it will form a base in water.Since it still has hydrogen it can serve as an acid,Thus in aqueous solution it acts either way depending upon whether acid or base is added.......
The last H+ attached to the PO4--- ion is held very tightly, it will not dissociate to form an acid. If the pH of the solution is neutral, the HPO4-- ion will take an H+ from the water (forming H2PO4-), leaving OH- ions behind. So it will form a base in water.

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It is amphoteric (a buffer) since it is the conjugate base of a weak acid:
H3O+ + HPO4= ---------> H2PO4- + H2O

Since it still has hydrogen it can serve as an acid, proton donor:
HPO4= + OH- ------------> H2O + PO4^-3

Thus in aqueous solution it acts either way depending upon whether acid or base is added.
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