Oxidation Number of O2 and O3

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JamieVu_2C
Posts: 108
Joined: Thu Jul 25, 2019 12:16 am

Oxidation Number of O2 and O3

Postby JamieVu_2C » Mon Feb 24, 2020 1:10 am

How do you know that O3 is being reduced in the reaction of O3(aq) --> O2(g) when both O3 and O2 have an oxidation state of 0 since they're both molecules?

Brian_Ho_2B
Posts: 221
Joined: Fri Aug 09, 2019 12:16 am

Re: Oxidation Number of O2 and O3

Postby Brian_Ho_2B » Mon Feb 24, 2020 8:50 am

Two ways that we know that O3 is being reduced is we know that in a redox reaction, one thing must be reduced while the other must be oxidized. We know that the other element in this problem (I don't remember what it was but I remember it was oxidized), was oxidized, so the other substance O3 must have been reduced. The other way of knowing is that if you balance the reduction reaction of O3 --> O2 in either acidic or basic conditions, you'll see that the side with O3 is receiving electrons, which indicates that O3 is the reduced element.

405268063
Posts: 102
Joined: Thu Jul 25, 2019 12:17 am

Re: Oxidation Number of O2 and O3

Postby 405268063 » Mon Feb 24, 2020 10:05 am

In cases like this, I usually look at whether the other molecule involved the reaction is being oxidized or reduced, and then use process of elimination.

Sam McNeill 1E
Posts: 110
Joined: Sat Aug 24, 2019 12:17 am

Re: Oxidation Number of O2 and O3

Postby Sam McNeill 1E » Mon Feb 24, 2020 5:15 pm

In a redox reaction, there must be both reduction and oxidation, so I would use process of elimination. Also, once you balance out the equation using H+ and H2O, it should be clear which side needs electrons to balance out the charges, and from there you can also decide if it is reduction or oxidation.


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