P - HNO3 rarr- H3PO4 - NO2 - H2O solve by ion electron method

P + HNO3 â†’ H3PO4 + NO2 + H2O nbsp;Oxidation half reaction P â†’ H3PO4Reduction half reaction HNO3 â†’ NO2Balance oxidation half reaction:P + 4 H2O â†’ H ...

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Standard IX

Chemistry

Oxidation and Reduction

P + HNO3 r...

Question

P + HNO3 → H3PO4 + NO2 + H2O solve by ion electron method

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Solution

P + HNO₃ â†’ H₃PO₄ + NO₂ + H₂O

Oxidation half reaction - P â†’ H₃PO₄
Reduction half reaction - HNO₃ â†’ NO₂
Balance oxidation half reaction:
P + 4 H₂O â†’ H₃PO₄ + 5H⁺
Balance the charge in the above reaction:
P + 4 H₂O â†’ H₃PO₄ + 5H⁺+ 5e- ---------------(1)
Balance reduction half reaction:
HNO₃ + H+ â†’ NO₂ + H₂O
Balance the charge:
HNO₃ + H⁺ + e- â†’ NO₂ + H₂O
Multiply reduction half reaction with 5 to make the number of electrons in oxidation and reduction reaction equal.
5 HNO₃ + 5H⁺ + 5e- â†’ 5 NO₂ + 5 H₂O -----(2)
Add (1) and (2) and cancel same substances.
P + 5 HNO₃ â†’ H₃PO₄ + 5 NO₂ + H₂O
This is the balanced equation.

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