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. PbI2(aq) Express your answers as chemical equations separated by a comma. Identify all of the phases in your answer. Na2SO_4(aq) Express your answers as chemical equations separated by a comma. Identify all of the phases in your answer.

Explanation / Answer

Answer:

Part A

Anode: Na --------> Na+ + e-   Eo=2.71 V(using standard data)

Cathode: Br2 + 2e-  -------> 2Br-    Eo=1.06 V(using standard data)

Eocell = Eoreduction + Eooxidation

Eocell = 1.06 + 2.71

Eocell = 3.77V

Part B

Anode: Pb --------> Pb2+ + 2e-   Eo=0.13 V(using standard data)

Cathode: I2 + 2e-  -------> 2I-    Eo=0.54 V(using standard data)

Eocell = Eoreduction + Eooxidation

Eocell = 0.13 + 0.54

Eocell = 0.67 V

Part C

Anode: Na --------> Na+ + e-   Eo=2.71 V(using standard data)

Cathode: SO42+ + 4H+ + 2e-  -------> 2H2O + SO2     Eo=0.17 V(using standard data)

Eocell = Eoreduction + Eooxidation

Eocell = 0.17 + 2.71

Eocell = 2.88V

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.