I am wondering if it is possible to find the electrode potential of such a half cell:

$$\ce{Br2 (l) + 2 e- <=> 2Br-(g)}$$

The standard electrode potential is for $\ce{Br-(aq)}.$ However, is it possible to measure such a half cell? And if yes, will I be able to find this value from a reputable source?

  • $\begingroup$ Not all redox potentials are measurable, but they can be formally calculated from reaction Gibbs energy with involved SHE half cell. $\endgroup$
    – Poutnik
    Commented Sep 4, 2021 at 11:10
  • $\begingroup$ Half cell potential of $\ce{Br2/Br^-}$ has a standard redox potential equal to +$1.06$ V. It can be measured if this half-cell has a platinum electrode which is coupled with any other half-cell. $\endgroup$
    – Maurice
    Commented Sep 4, 2021 at 11:43
  • $\begingroup$ @Maurice Have you noticed (g)? $\endgroup$
    – Poutnik
    Commented Sep 4, 2021 at 12:16
  • $\begingroup$ @Poutnik. I have not seen the (g). But it is impossible to have a lonely ion in the gaseous state after such a half-reaction. So this question does not have any meaning $\endgroup$
    – Maurice
    Commented Sep 4, 2021 at 18:29


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