How is pyrophosphoric acid related to orthophosphoric acid ?

1.	How is pyrophosphoric acid related to orthophosphoric acid ?
Answer» SOLUTION :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)`. For structures, refer to PAGE 11//137. `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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