Enter the balanced half reaction that takes placeat the cathode for the electroc

Question

Enter the balanced half reaction that takes placeat the cathode for the electrochemical cell shown. Be sure toinclude electrons.

Pt(s) l NO(g) l NO3-(aq), H+(aq)ll SO42-(aq), H+(aq) lPbO2(s) l PbSO4(s) l Pt(s) St. Red. Pot. (V) NO3-/NO +0.96 PbO2/PbSO4 +1.69 Enter the balanced half reaction that takes placeat the cathode for the electrochemical cell shown. Be sure toinclude electrons.

Pt(s) l NO(g) l NO3-(aq), H+(aq)ll SO42-(aq), H+(aq) lPbO2(s) l PbSO4(s) l Pt(s) St. Red. Pot. (V) NO3-/NO +0.96 PbO2/PbSO4 +1.69

Explanation / Answer

       Oxidation half cell Reaction :               NO -----> NO3- +  3e ] x 2      Reduction half cell Reaction:                  PbO2 + 2e ------> PbSO4 ] x 3          Net Cell Reaction :                  2 NO + 3 PbO2 ------> 2NO3-   + 3PbSO4                    E0cell  = E0cathode - E0anode                                                = + 1.69 V - ( + 0.96 ) V                           = + 0.73 V

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