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How is pyrophosphoric acid related to orthophosphoric acid ?

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How is pyrophosphoric acid related to orthophosphoric acid ?
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Pyrophosphoric acid `(H_(4)P_(2)O_(7))` is the anhydride of orthophosphooric acid and is obtained by removal of a molecule of `H_(2)O` from two molecules of `H_(3)PO_(4)`.
`underset("Orthophophoric acid")(2H_(3)PO_(4))overset(523 K)tounderset("Pyrophosphoric acid")(H_(4)P_(2)O_(7))+H_(2)O`
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