E° as state function?


Moderators: Chem_Mod, Chem_Admin

Lindsey Chheng 1E
Posts: 110
Joined: Fri Aug 30, 2019 12:16 am

E° as state function?

Postby Lindsey Chheng 1E » Sat Feb 22, 2020 3:59 pm

Is the reason we're able to add and subtract E°cathode and anode because it's a state function?

Dina Marchenko 2J
Posts: 54
Joined: Thu Jul 25, 2019 12:16 am

Re: E° as state function?

Postby Dina Marchenko 2J » Sat Feb 22, 2020 4:22 pm

Cell potential is not a state function. Cathode and anode has to do with a single cell at a particular point in time so combining their values gives the cell potential by definition. However, you can't simply find a new cell potential by subtracting some initial value from a final value, so it is not a state function.

Aarja Pavade 1H
Posts: 103
Joined: Sat Aug 17, 2019 12:18 am

Re: E° as state function?

Postby Aarja Pavade 1H » Sat Feb 22, 2020 4:38 pm

Consider E° is an intensive property, meaning that the voltage difference will remain the same and not depend on how many times the reaction occurs. It gives the voltage difference between 2 standard electrodes (cathode-anode) which is always the same.

Lauren Tanaka 1A
Posts: 109
Joined: Sat Aug 17, 2019 12:18 am

Re: E° as state function?

Postby Lauren Tanaka 1A » Sun Feb 23, 2020 1:47 pm

E is not a state function and because of this we can't apply the same rules as we did for enthalpy and gibbs free energy. It is an intensive property so the value would stay the same no matter how many times the reaction occurs.


Return to “Work, Gibbs Free Energy, Cell (Redox) Potentials”

Who is online

Users browsing this forum: No registered users and 2 guests