What Is the Minimum Voltage Required for the Electrolysis of 1.0

question 60

Multiple Choice

What is the minimum voltage required for the electrolysis of 1.0 M NaCl in neutral solution? 2H₂O + 2Cl^- (1.0 M) → H₂(1 atm) + Cl₂(1 atm) + 2OH^-(1 × 10^-7 M)
Note that
2H₂O(l) + 2e^- → H₂(g) +2OH^-(aq) ,E° = -0.83 V,
2H₂O(l) + 2e^- → H₂(g) +2OH^-(aq) ,E = -0.41 V([OH^-] = 1 × 10^-7M) ,
O₂(g) + 4H⁺(aq) + 4e^- →2H₂O(l) ,E° = +1.23 V,
Cl₂(g) + 2e^- → 2Cl^-(aq) E° = +1.36 V,and
Na⁺(aq) + e^- → Na(s) E° = -2.71 V

• A)2.19 V
• B)1.77 V
• C)0.41 V
• D)-0.41 V
• E)-1.78 V

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