Test #2

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nelms6678
Posts: 53
Joined: Fri Sep 29, 2017 6:07 am

Test #2

Postby nelms6678 » Wed Mar 07, 2018 11:10 am

calculate the K of the following redox rxn:
Ag+(aq) + Cu(s) ---> Ag(s) + Cu2+(aq)

How would you start this problem?

nelms6678
Posts: 53
Joined: Fri Sep 29, 2017 6:07 am

Re: Test #2

Postby nelms6678 » Wed Mar 07, 2018 11:10 am

Then it asks is the rxn spontaneous?
Is it true that for spontaneity K<1?

mayasinha1B
Posts: 70
Joined: Fri Sep 29, 2017 6:04 am

Re: Test #2

Postby mayasinha1B » Wed Mar 07, 2018 11:19 am

You would look up the half reactions given in the table for Ag and Cu, and put together the half reactions to get the full balanced redox reaction. You would then use the given E standard values for the half reactions in order to solve for E standard for the full reaction. This can get you the value of delta G (from -nFE) and you use this delta G value to plug into the equation (delta G=-RT ln K) to solve for K.

mayasinha1B
Posts: 70
Joined: Fri Sep 29, 2017 6:04 am

Re: Test #2

Postby mayasinha1B » Wed Mar 07, 2018 11:20 am

If K>1 then that means the reaction favors the products, so the reaction is spontaneous.

Kayla Tchorz-Dis 1F
Posts: 30
Joined: Thu Jul 13, 2017 2:00 am

Re: Test #2

Postby Kayla Tchorz-Dis 1F » Sun Mar 11, 2018 9:39 pm

K>1 means its spotaneous, essentially its the opposite of delta g.


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