Oxidation Numbers

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Ellis Song 4I
Posts: 102
Joined: Thu Jul 11, 2019 12:17 am

Oxidation Numbers

Postby Ellis Song 4I » Thu Feb 20, 2020 11:09 am

How do you find oxidation numbers?

Benjamin Feng 1B
Posts: 102
Joined: Sat Sep 07, 2019 12:19 am

Re: Oxidation Numbers

Postby Benjamin Feng 1B » Thu Feb 20, 2020 1:04 pm

Typically, you assume that hydrogen has an oxidation state of 1+, and oxygen 2-. From there, you can calculate the unknown oxidation numbers based on the total net charge of the molecule. For ionic compounds, you can use their charges.

Posts: 104
Joined: Wed Sep 18, 2019 12:20 am

Re: Oxidation Numbers

Postby bellaha4F » Thu Feb 20, 2020 2:38 pm

halogens are usually -1, oxygen is -2 (with exceptions), hydrogen is -1, and pure elements are 0. you can also sometimes tell by the group/charge of the element.

Maya Beal Dis 1D
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Joined: Sat Aug 17, 2019 12:16 am
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Re: Oxidation Numbers

Postby Maya Beal Dis 1D » Thu Feb 20, 2020 3:53 pm

The sum of the oxidation numbers in a molecule must equal the overall charge.

Maggie Eberhardt - 2H
Posts: 97
Joined: Sat Jul 20, 2019 12:16 am

Re: Oxidation Numbers

Postby Maggie Eberhardt - 2H » Thu Feb 20, 2020 10:02 pm

sorry to sort of make everyone reiterate, but is there a set of rules we can follow to know exactly what the oxidation number of a molecule is? I hear a lot of different strategies/things to check but no one seems to be certain. Thanks!

Michelle Xie 2B
Posts: 99
Joined: Sat Aug 17, 2019 12:18 am

Re: Oxidation Numbers

Postby Michelle Xie 2B » Thu Feb 20, 2020 10:32 pm

There's some rules to follow, such as oxygen is almost always 2-, fluorine is almost always 1-, etc. The oxidation numbers of all the elements should add up to the charge.

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