Discerning what is being reduced and oxidized? HW 14.15a

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Johnchou1A
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Joined: Fri Sep 25, 2015 3:00 am

Discerning what is being reduced and oxidized? HW 14.15a

Postby Johnchou1A » Thu Feb 04, 2016 12:02 am

AgBr(s) <-> Ag+ + Br-

In this case, how can we tell which species is being reduced and which is being oxidized? Some equations make seeing which species is oxidized/reduced easier because you can clearly see which charges decrease/increase, but how would we write the oxidation and reduction half reactions for the above equation? Would we have to look at the redox potentials chart?

GabrielaG 1J
Posts: 20
Joined: Fri Sep 25, 2015 3:00 am

Re: Discerning what is being reduced and oxidized? HW 14.15a

Postby GabrielaG 1J » Thu Feb 04, 2016 4:46 pm

The charges may not be obvious but they are still there.
On the right half of the equation:
- We know that Br- has a -1 charge.
- Ag has a charge of 0 since it is by itself.
On the left half of the equation:
- AgBr(s) overall has a neutral charge but individually the Br has a -1 charge and the Ag has a +1 charge to cancel out the -1 Br charge.

Rachel Lipman
Posts: 45
Joined: Fri Sep 25, 2015 3:00 am

Re: Discerning what is being reduced and oxidized? HW 14.15a

Postby Rachel Lipman » Thu Feb 04, 2016 5:11 pm

Anytime an element is alone such as Ag is the charge is 0? Is that the best way to determine in a situation like this reaction what is the anode and what is the cathode?


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