## Oxidation States

Vanessa Romero-Campos 2B
Posts: 39
Joined: Fri Sep 25, 2015 3:00 am

### Oxidation States

How do you determine which elements are undergoing changes in oxidation states?

Ex: H(+) + Cr2O7 (2-) + C2H5OH ----> Cr(3+) + C2H4O +H20

I know that Cr is one of the elements, but how is Carbon also undergoing changes?

Kyle_Nakahira_1B
Posts: 9
Joined: Wed Sep 21, 2016 2:59 pm

### Re: Oxidation States

If the element undergoes a change in its charge, then there is a change in its oxidation state.

Terry1A
Posts: 8
Joined: Fri Jul 15, 2016 3:00 am

### Re: Oxidation States

In that example you can see that C appears in two different compounds in the reactant and product (C2H5OH and C2H4O). You can calculate the charge of the C in C2H5OH because the charge for H is +1 and O is -2, so in order to neutralize the overall charge, C is -1. Then you do the same for the C in C2H4O and find that its charge is -1. Because the charge of C changed from -2 to -1 from reactant to product, you know that C is oxidized.

Cayla_Brooks_1I
Posts: 10
Joined: Mon Jan 26, 2015 2:17 pm

### Re: Oxidation States

When solving a two part problem asking you to balance a reaction under basic conditions (part a) then to balance the same reaction under acidic conditions (part b) how are you to navigate between adding H2O and OH-