Question

For a particular redox reaction NO2– is oxidized to NO3– and Cu2 is reduced to Cu...

For a particular redox reaction NO2– is oxidized to NO3– and Cu2 is reduced to Cu . Complete and balance the equation for this reaction in basic solution. Phases are optional.

Homework Answers

Answer #1

While balancing O and H - atoms in basic medium follow the below steps

For each excess O - atom, add 1 H2O molecule on the same side and 2 OH- ions on the opposite side.

O + H2O ---------> 2OH-

For each excess H- atom, add 1 OH- ions on the same side and 1 H2O molecule on the opposite side.

H + OH-   ---------> H2O

Hence the balanced oxidation - half reaction is

Oxidation - half reaction: NO2-(aq) + 2OH-(aq) ----- > NO3-(aq) + H2O + 2e-

Reduction - half reaction: Cu2+(aq) + 2e- ------- > Cu(s)

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Complete balanced reaction: NO2-(aq) + 2OH-(aq) + Cu2+(aq) ------ > NO3-(aq) + H2O + Cu(s) (answer)

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