Balancing Equations

Moderators: Chem_Mod, Chem_Admin

Brandon Tao 1K
Posts: 100
Joined: Sat Aug 17, 2019 12:15 am

Balancing Equations

Postby Brandon Tao 1K » Sun Feb 23, 2020 11:12 pm

How do you determine what is being oxidized or reduced? By looking at the oxidation number?

madawy
Posts: 81
Joined: Fri Aug 09, 2019 12:17 am

Re: Balancing Equations

Postby madawy » Sun Feb 23, 2020 11:13 pm

handy steps found online :)

To determine if a redox reaction has occurred and to identify the element oxidized and the element reduced:

Assign oxidation numbers to all atoms in the equation. (NOTE: Ignore the coefficients in the equation. They are not important when determining the oxidation numbers.)
Compare oxidation numbers from the reactant side to the product side of the equation.
If a redox reaction has occurred, you will find that the oxidation numbers of two (no more/no less) elements has changed from the reactant side to the product side.
The element oxidized is the one whose oxidation number increased.
The element reduced is the one whose oxidation number decreased.

KarineKim2L
Posts: 100
Joined: Fri Aug 30, 2019 12:16 am

Re: Balancing Equations

Postby KarineKim2L » Sun Feb 23, 2020 11:13 pm

Yes. Whatever has an oxidation number that becomes lower in the products is reduced, and whatever has an oxidation number that increases in the products is oxidized.

505316964
Posts: 95
Joined: Thu Jul 11, 2019 12:17 am

Re: Balancing Equations

Postby 505316964 » Sun Feb 23, 2020 11:14 pm

If the oxidation number is increasing, it's being oxidized.
If the oxidation number is decreasing, it's being reduced.

Savannah Mance 4G
Posts: 107
Joined: Fri Aug 30, 2019 12:17 am

Re: Balancing Equations

Postby Savannah Mance 4G » Sun Feb 23, 2020 11:14 pm

The element or molecule that is being oxidized is the one that is losing electrons and whichever is being reduced is the one that is gaining electrons. My high school chem teacher taught us the acronym OIL RIG to help us remember (oxidation is loss of e- and reduction is gain of e-). Hope that helps :)

Shrayes Raman
Posts: 129
Joined: Sat Jul 20, 2019 12:15 am

Re: Balancing Equations

Postby Shrayes Raman » Sun Feb 23, 2020 11:41 pm

Look at both sides of the equation and determine which species is gaining electons and which is losing and that should tell you which is being oxidized and which is reduced.


Return to “Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams”

Who is online

Users browsing this forum: No registered users and 1 guest