What is the oxidation number of the phosphorus in Pyrophosphoric acid?

The oxidation number of phosphorus in Pyrophosphoric acid is +5.

The total number of electrons that an atom either gains or loses to form a chemical bond with another atom is known as the oxidation number. Pyrophosphoric acid is a tetraprotic acid with the formula H4P2O7. 

Pyrophosphoric acid H4P2O7

Let oxidation state of phosphorus is x

(4 x 1 + (-2) x 7+2x)=0

2x=10

x=+5

 

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