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Consider the standard reduction potentials for the following bromine species in acidic medium: BrO ₃^- 1.50 V HBrO 1.60 V Br ₂ The standard electrode potential ( E ^ ) for the overall reduction of BrO ₃^- to Br ₂ is:

Options

  1. A3.10 V
  2. B1.55 V
  3. C1.52 V
  4. D1.54 V

Correct answer

C. 1.52 V

Step-by-step solution

The oxidation state of Br in BrO ₃^- is +5. The oxidation state of Br in HBrO is +1. The oxidation state of Br in Br ₂ is 0. For the first step ( BrO ₃^- HBrO ), the number of electrons transferred is n₁ = 5 - 1 = 4 . For the second step ( HBrO Br ₂ ), the number of electrons transferred per bromine atom is n₂ = 1 - 0 = 1 . For the overall reaction ( BrO ₃^- Br ₂ ), the total number of electrons transferred is n₃ = 5 - 0 = 5 . Using the relationship between standard Gibbs free energy and electrode potential, G ^ =

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