oxidation numbers

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Alison Trinh 1E
Posts: 104
Joined: Thu Jul 25, 2019 12:16 am

oxidation numbers

Postby Alison Trinh 1E » Sat Mar 14, 2020 10:27 pm

How do you find the oxidation numbers of elements to balance redox reactions?

Katie Kyan 2K
Posts: 106
Joined: Fri Aug 09, 2019 12:16 am
Been upvoted: 1 time

Re: oxidation numbers

Postby Katie Kyan 2K » Sat Mar 14, 2020 10:37 pm

You have to check the overall charge of the compound in order to find the oxidation number of the elements. For example for MnO4-, we know that the charge of oxygen is 2- so with four oxygens this makes up a charge of 8-. The overall charge of the compound is 1- so that means the charge of Mn must be 7+.

Posts: 56
Joined: Tue Nov 13, 2018 12:18 am

Re: oxidation numbers

Postby kennedyp » Sun Mar 15, 2020 6:14 am

I found a really good video explaining how to find them if you have the time to watch before Final real quick! I post the link below. Good luck! https://www.youtube.com/watch?v=-a2ckxhfDjQ

Hui Qiao Wu 1I
Posts: 56
Joined: Fri Aug 30, 2019 12:16 am

Re: oxidation numbers

Postby Hui Qiao Wu 1I » Sun Mar 15, 2020 2:04 pm

There are some basic ones that you'll just have to remember:
hydrogen is +1 when bound to nonmetal but is -1 when bound to a metal
oxygen in the form of O^2 is -1; all other forms are -2

Aiden Metzner 2C
Posts: 104
Joined: Wed Sep 18, 2019 12:21 am

Re: oxidation numbers

Postby Aiden Metzner 2C » Mon Mar 16, 2020 3:58 pm

Count the oxygens and hydrogens in the molecule. The oxygens are -2 and the hydrogens are +1, the other element in the molecule will add to these elements to get the molecule to whatever charge it is.

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