Oxidation number

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melissa_dis4K
Posts: 106
Joined: Fri Sep 28, 2018 12:28 am

Oxidation number

Postby melissa_dis4K » Wed Dec 05, 2018 11:56 am

When finding the oxidation number do I need to do the Lewis structure to find the charge of Cl, for example in [Fe Cl(OH2)5]^+ Or how can I find the charge of chloride to be able to find the oxidation number of the central atom? Thank you!

Jasmine Chow 1F
Posts: 60
Joined: Fri Sep 28, 2018 12:16 am
Been upvoted: 1 time

Re: Oxidation number

Postby Jasmine Chow 1F » Wed Dec 05, 2018 12:21 pm

Cl will always have a negative 1- charge. So say you have something that says Cl2 then the overall charge will be 2-.
In the case of [Fe Cl(OH2)5]^+
you will find the oxidation number of Fe.
So Oh2 is a neutral ligand therefore there is no charge from this molecule.
Since Cl is the only component that gives a negative charge you need a oxidation number of 2+ for Fe. This will then make the overall formal charge 1+.

Fe(II) + Cl(-1) = +1

Drawing the lewis structure helps too, most questions will ask you to draw the lewis structure with it.
When I do it, to check, I write out the charges of all the ligands and given anions. Then I determine the final oxidation number of the metal that will give me the needed overall formal charge given (in this case +1).

Hope this helps?

Madeline Lequang 1G
Posts: 30
Joined: Fri Sep 28, 2018 12:27 am

Re: Oxidation number

Postby Madeline Lequang 1G » Wed Dec 05, 2018 9:13 pm

You said to draw out the lewis structure to help determine the charges for oxidation numbers, but I still don't understand how that helps.


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