Oxygen Ion Charge

Moderators: Chem_Mod, Chem_Admin

JavierMelgoza2E
Posts: 10
Joined: Wed Nov 18, 2015 3:00 am

Oxygen Ion Charge

Postby JavierMelgoza2E » Sun Feb 05, 2017 11:09 pm

Looking at Redox rules that some of the elements have and I saw that Oxygen has a -1 charge rather than a -2. How can that be? Is there certain compounds that will cause oxygen to have a -1 charge? Does oxygen impact the charge on other elements as well? Thanks!

kimberly_oka_2j
Posts: 9
Joined: Wed Sep 21, 2016 2:59 pm

Re: Oxygen Ion Charge

Postby kimberly_oka_2j » Sun Feb 05, 2017 11:31 pm

Yes, there are some exceptions to the typical -2 oxidation number of oxygen. One example is in peroxides (H2O2). Because the compound is overall neutral and because the oxidation number of hydrogen +1, the oxidation number of oxygen must be -1. Another example is in F2O. Fluorine is more electronegative and has an oxidation number of -1 so the oxygen in that molecule has to have an oxidation number of +2. I hope this helps! Generally, you need to pay attention to the presence of hydrogen and the electronegativity of a specific element.

Grace_Bower_2B
Posts: 13
Joined: Wed Sep 21, 2016 2:58 pm

Re: Oxygen Ion Charge

Postby Grace_Bower_2B » Sun Feb 05, 2017 11:36 pm

Do you have the rules written out somewhere, because I'm not sure what you're talking about? Oxygen almost always has an oxidation state of -2 (like you would expect from its position in the periodic table and it's electron configuration).
There are certain compounds that cause oxygen to have a -1 charge, peroxides and F2O.
Atoms in compounds can impact the charge on other atoms in the compound. For example, oxygen has an oxidation state of -1 in hydrogen peroxide because H2O2 is a neutral compound. Therefore, the sum of the oxidation states of the atoms is equal to zero. Hydrogen has an oxidative state of +1 so oxygen must have an oxidative state of -1 to make the neutral compound. In the case of F2O, fluorine is more electronegative than oxygen so it pulls the electrons toward it, making oxygen act positive.

Laura_funes_1j
Posts: 8
Joined: Mon Jan 26, 2015 2:17 pm

Re: Oxygen Ion Charge

Postby Laura_funes_1j » Sun Feb 05, 2017 11:37 pm

In addition, oxygen can even have a -.5 charge in superoxides.


Return to “Balancing Redox Reactions”

Who is online

Users browsing this forum: No registered users and 2 guests