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### oxidation number

Posted: Sun Feb 16, 2020 11:13 pm
how do you calculate oxidation numbers?

### Re: oxidation number

Posted: Sun Feb 16, 2020 11:24 pm
You look at the known charges or the charges that are present on the specific element in the reaction, and make it equal that charge. If there is no charge present on a compound then the oxidation numbers cancel out!

### Re: oxidation number

Posted: Sun Feb 16, 2020 11:25 pm
You have to check the known charges of the ions and make sure that they balance out for the entire equation.

### Re: oxidation number

Posted: Sun Feb 16, 2020 11:30 pm
Oxidation numbers are basically the charges on an atom/ion...do you have a specific question/reaction in mind?

By the way, I found this really helpful article on Khan Academy https://www.khanacademy.org/science/chemistry/chemical-reactions-stoichiome/types-of-chemical-reactions/a/oxidation-number if you wanted to take a look...

### Re: oxidation number

Posted: Mon Feb 17, 2020 12:13 am
From the periodic table, which ones are the common ones when they are the most electronegative?

### Re: oxidation number

Posted: Mon Feb 17, 2020 12:26 am
You can just memorize the charge for the basic elements like oxygen, nitrogen, carbon, hydrogen, etc. And the others are pretty similar to their ion charge, so just know that.

### Re: oxidation number

Posted: Mon Feb 17, 2020 2:35 pm
you can also find oxidation numbers in the context of the reactions, like when you write out the oxidation and reduction half-reactions

### Re: oxidation number

Posted: Mon Mar 09, 2020 12:18 am
H is +1, O is -2. The sum of oxidation numbers is equal to the overall charge of the compound, so do some backwards calculations to figure out oxidation numbers of other compounds.

### Re: oxidation number

Posted: Mon Mar 09, 2020 12:58 am
You need to take the known charges of the elements in the molecule and then find the different between that and the overall charge of the reaction.

### Re: oxidation number

Posted: Mon Mar 09, 2020 9:51 pm
it also can depend on the reaction and the compound

### Re: oxidation number

Posted: Mon Mar 09, 2020 10:38 pm
It is important to know that O has an oxidation number of 2- and H has an oxidation number of 1+. You are usually given the overall charge of a molecule. All the individual charges should add up to the overall charge. Thus, you can then solve for the unknown oxidation number.