Values of Standard Electrode Potentials


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Sarah Zhari 1D
Posts: 103
Joined: Sat Sep 14, 2019 12:16 am

Values of Standard Electrode Potentials

Postby Sarah Zhari 1D » Sun Mar 01, 2020 12:18 am

Why are some standard electrode potentials negative and some positive? What does this mean in relation to the hydrogen electrode?

CMaduno_1L
Posts: 102
Joined: Wed Sep 18, 2019 12:18 am

Re: Values of Standard Electrode Potentials

Postby CMaduno_1L » Sun Mar 01, 2020 9:29 am

In regards to the first part of your question, I believe that a negative value for standard electrode potentials indicates that the element or compound in question forms ions easily.

Rida Ismail 2E
Posts: 139
Joined: Sat Sep 07, 2019 12:16 am

Re: Values of Standard Electrode Potentials

Postby Rida Ismail 2E » Sun Mar 01, 2020 11:40 am

I thought the positive and negative relate to spontaneity. Like if it is positive the reduction is spontaneous.

Andrew F 2L
Posts: 103
Joined: Sat Aug 17, 2019 12:17 am

Re: Values of Standard Electrode Potentials

Postby Andrew F 2L » Sun Mar 01, 2020 12:33 pm

I believe the poster above me is correct in that it relates to spontaneity of reactions but also sometimes the cell diagram is reversed and the cathode and anode are switched places so I believe the cell potential can also change its value in such a way so you would understand that the reverse reaction can be spontaneous or not .

Lauren Stack 1C
Posts: 100
Joined: Sat Aug 17, 2019 12:18 am

Re: Values of Standard Electrode Potentials

Postby Lauren Stack 1C » Sun Mar 01, 2020 4:21 pm

A negative E values means that the reaction is not spontaneous, while if the E value is positive, then the reaction is spontaneous. You can see this connection through the relation of delta G= -nFE.


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