Which Half-Eqn to Use for H2O?

 

 

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  • In aqueous solutions (neutral)

 

H2O is oxidised to O2

H2O is reduced to H2

 

  • In acidic solutions (H+ present in significant amounts)

 

H2O is oxidised to O2

H+ is reduced to H2

 

  • In alkaline solutions (OH– present in significant amounts)

 

OH– is oxidised to O2

H2O is reduced to H2

 

  • In the presence of H2O2

 

H2O2 is oxidised to O2

H2O2 is reduced to H2O