In a particular redox reaction, NO2– is oxidized to NO3– and Cu2+ is reduced to Cu+ . Complete and balance the equation for this reaction in acidic solution. Phases are optional.
Reduction half cell:
Cu+2 + 1e- --> Cu+
Oxidation half cell:
NO2- --> NO3- + 2e-
Balance number of electrons to be same in both half reactions
Reduction half cell:
2 Cu+2 + 2e- --> 2 Cu+
Oxidation half cell:
NO2- --> NO3- + 2e-
Lets combine both the reactions.
2 Cu+2 + NO2- --> 2 Cu+ + NO3-
Balance Oxygen by adding water
2 Cu+2 + NO2- + H2O --> 2 Cu+ + NO3-
Balance Hydrogen by adding H+
2 Cu+2 + NO2- + H2O --> 2 Cu+ + NO3- + 2 H+
This is balanced chemical equation in acidic medium
Answer:
2 Cu2+ + NO2- + H2O --> 2 Cu+ + NO3- + 2 H+
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