Write equations for the half-reactions that occur at the anode and cathode for t

Question

Write equations for the half-reactions that occur at the anode and cathode for the electrolysis of each of the following aqueous solutions. For the following problems, do not consider overvoltage. Use Table 20-1 on page 825 to find the standard electrode potentials. NaBr(aq) Express your answers as chemical equations separated by a comma. Identify all of the phases in your answer. 2H_2O(I) rightarrow O_2 (g) + 4H^+ (aq) + 4e^-, 2H_2 O(I) + 2e^- rightarrow H_2 (g) + 2OH^- (aq) PbI_2 (aq) Express your answers as chemical equations separated by a comma. Identify all of the phases in your answer. Na_2 SO_4 (aq) Express your answers as chemical equations separated by a comma. Identify all of the phases in your answer.

Explanation / Answer

Electrode equations

Part A) NaBr(aq)

Na(s) --> Na+(aq) + e-, Br2(aq) + 2e- --> 2Br-(aq)

Part B) PbI2(aq)

Pb(s) --> Pb2+ + 2e-, I2(s) + 2e- --> 2I-(aq)

Part C) Na2SO4(aq)

2H2O(l) --> O2(g) + 4H+(aq) + 4e-, 2H+(aq) + 2e- --> H2(g)

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