Complete and balance the following redox reaction under basic conditions. Cu(s)

Question

Complete and balance the following redox reaction under basic conditions. Cu(s) + NO_3-(aq) right arrow Cu^2+(aq) + NO_2(g) Cu(s) right arrow Cu^2+ NO_3- right arrow NO_2(s) A current of 1.26 A is passed through an electrolytic cell containing a dilute sulfuric acid solution for 6.44 h. Write the half-cell reactions and calculate the volume of gases generated at STP. For the reaction: Anode (oxidation): 2H_2O(l) O_2(g) + 4H^+(aq) + 4e^- Cathode (reduction): 2[2H^+(aq) + 2e^- H_2(g)] 2H_2O(l) 2H_2(g) + O_2(g)

Explanation / Answer

3. Seperate the half reactions

Now add both Cu + 2NO3- + 2H2O -------------->   Cu2+ + 2NO2 + 4OH-

Oxidation half Reduction half Cu -----> Cu2+ NO3- -------> NO2 Cu ------> Cu2+ + 2e- NO3- + H2O + e- -------> NO2 + 2OH- 2NO3- + 2H2O + 2e- -------> 2NO2 + 4OH-

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