oxidation states

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Mariane Sanchez 1E
Posts: 57
Joined: Fri Sep 29, 2017 7:07 am

oxidation states

Postby Mariane Sanchez 1E » Tue Feb 20, 2018 1:01 am

How do you find the oxidation state of an element/molecule? Is it just something you memorize?

Ethan Vuong 3G
Posts: 51
Joined: Fri Sep 29, 2017 7:07 am

Re: oxidation states

Postby Ethan Vuong 3G » Tue Feb 20, 2018 1:04 am

You use the periodic table and count the number of electrons needed to gain or lose to be the same as the noble gases.

Jessica Nunez 1I
Posts: 58
Joined: Thu Jul 13, 2017 3:00 am

Re: oxidation states

Postby Jessica Nunez 1I » Tue Feb 20, 2018 8:05 am

An example of finding the oxidation state could be MnO4-. We know the overall charge of MnO4- is -1 and oxygen as O4 has a charge of -8, so we only need to find the charge of Mn.

x + 4(-2) = -1

x-8 = -1

x = +7

The charge of Mn is +7.

Karen Ung 2H
Posts: 52
Joined: Fri Sep 29, 2017 7:04 am
Been upvoted: 1 time

Re: oxidation states

Postby Karen Ung 2H » Tue Feb 20, 2018 12:56 pm

Additoinally, there are a few rules you can follow when determining oxidation states. H will always have the oxidation state of +1. O will have the oxidation state of -2, except in H2O2, when oxygen's oxidation state is -1. The charges of elements are the oxidation state numbers. For example, Cr 3+ has an oxidation number of 3+.

soniatripathy
Posts: 50
Joined: Thu Jul 13, 2017 3:00 am

Re: oxidation states

Postby soniatripathy » Wed Mar 14, 2018 2:45 pm

there are a few basic rules that you are supposed to memorize for assigning oxidation numbers. I found that this video is really helpful for learning them: https://www.youtube.com/watch?v=-a2ckxhfDjQ
Hopefully this video helps!


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