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What is the pH of a 0.1M Na2HPO4 solution?

What is the pH of a 0.1M Na2HPO4 solution? (Note that HPO4- is amphoteric)

** I don't understand what to do with HPO4- being amphoteric in this problem.

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What is the pH of a 0.1M Na2HPO4 solution? (Note that HPO4- is amphoteric) Amphoteric means:
it can gain a H+ or lose 1
Gain
Lose H+ + HPO4^2- <==> H2PO4HPO4^2-<==> PO4^3- +H+ Above...

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