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Balance the following equation using half reaction method: 

Cu + NO-3 → Cu2+ + NO2

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Best answer

Separating into half reactions: 

Oxidation half: Cu → Cu2+

Reduction half: NO-3 → NO2 

Balancing oxygen and hydrogen atoms: 

NO-3 + 2H+ → NO2  + H2

Balancing charge by adding electrons and making the number of electrons equal in the two half reactions: 

Cu → Cu2+ + 2e- 

2NO-3  + 4H+ + 2e- → 2NO + 2H2

Adding the two half reactions to achieve the overall reaction: 

Cu + 2NO3 + 4H+→ Cu2+ + 2NO2 + 2H2

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