Calculating Standard Potentials

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Letty Liu 2C
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Joined: Fri Aug 09, 2019 12:16 am

Calculating Standard Potentials

Postby Letty Liu 2C » Tue Feb 25, 2020 4:57 pm

When calculating standard potentials for electrodes and two redox reactions, do we just subtract the right from the left for electrodes but use standard Gibbs free energy for two redox reactions?

Justin Sarquiz 2F
Posts: 106
Joined: Fri Aug 30, 2019 12:15 am

Re: Calculating Standard Potentials

Postby Justin Sarquiz 2F » Wed Feb 26, 2020 8:35 am

To calculate the standard potential energy, you do Ecathode-Eanode. It is not always right minus left because someone could draw the anode on the right if he or she wanted to.

Posts: 49
Joined: Thu Jul 25, 2019 12:16 am

Re: Calculating Standard Potentials

Postby BAlvarado_1L » Wed Feb 26, 2020 8:53 am

the cell diagram should always have the cathode on the right so your method should be correct but to avoid getting the wrong answer due to an error in the set up of the cell diagram remember that it is E cathode - E anode

Shutong Hou_1F
Posts: 117
Joined: Sat Sep 14, 2019 12:17 am

Re: Calculating Standard Potentials

Postby Shutong Hou_1F » Fri Feb 28, 2020 8:45 pm

And remember that because standard potential energy is an intensive property, we don't need to multiply by coefficients.

Jialun Chen 4F
Posts: 108
Joined: Sat Sep 07, 2019 12:16 am

Re: Calculating Standard Potentials

Postby Jialun Chen 4F » Fri Feb 28, 2020 10:23 pm

Use the equation ECathode - EAnode; in a Galvanic cell, the standard setup is having anode on the left (oxidation) and cathode on the right (reduction).

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