Calculating standard potential  [ENDORSED]

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Nancy Le - 1F
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Calculating standard potential

Postby Nancy Le - 1F » Wed Feb 21, 2018 12:10 am

For exercise 33 part A, the solutions manual states that the standard Gibbs free energy should be negative because it's the reverse of the formation reaction, but why would this be so?

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Re: Calculating standard potential  [ENDORSED]

Postby Chem_Mod » Wed Feb 21, 2018 9:33 am

We are given the standard Gibbs free energy of formation for Tl3+ in the problem statement. Since we will be comparing this to the tabulated value of the standard reduction potential of the couple Tl3+/Tl, it is clear to see that this is the reverse of the standard Gibbs free energy of formation reaction for Tl3+. Thus, the value must be reversed because we are interested in the reverse of the formation reaction.


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