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The balance the equation for a half-reaction that occurs in acidic solution is given as,

[tex]P_{4}+16H_{2} O+20e^{-}[/tex] → [tex]4H_{3}PO_{4}+20H^{+}[/tex]

The half-reaction method to balance redox reactions in acidic aqueous solutions follows rule.

  • Balance elements in the equation other than O and H.
  • Balance the oxygen atoms by adding the appropriate number of water opposite side of the equation.
  • Balance the hydrogen atoms by adding proton ions ( [tex]H^{+}[/tex] ion) to the opposite side of the equation
  • Add up charge on each side of the equation by adding enough number of electrons to more positive side.
  • The [tex]e^{-}[/tex] on each side must be equal . Multiply by appropriate integers if they are nit equal.
  • The half -equation are added together, by cancelling out the electrons to form one balanced equation.

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