Given redox reactin:
2Cu + 2NO3- + 8H+ 3Cu2+ + 2NO2 + 4H2O
Oxidation half reaction (OHR):
Cu Cu2+
Cu Cu2+ + 2e- (balancing charge)
Reduction half reaction (RHR):
NO3- NO2
NO3- NO2 + H2O (balancing oxygen atoms)
NO3- + 2H+ NO2 + H2O (balancing hydrogen atoms)
NO3- + 2H+ + e- NO2 + H2O (balancing charge)
Multipy OHR with 1, RHR with 2 and add both of them, then we will get the following balanced equation.
Cu + 2NO3- + 4H+ Cu2+ + 2NO2 + 2H2O
Note: Please cross check the given equation, where both Cu and N are involving in oxidation. I have mentioned the given equation in a feasible manner. Please confirm once again. If any doubts, my doors are opened!!!
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