How do you combine half reactions together?

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205154661_Dis2J
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How do you combine half reactions together?

Postby 205154661_Dis2J » Sun Feb 16, 2020 11:07 pm

How do you combine half reactions together?

Jacob Puchalski 1G
Posts: 97
Joined: Fri Aug 09, 2019 12:16 am

Re: How do you combine half reactions together?

Postby Jacob Puchalski 1G » Sun Feb 16, 2020 11:10 pm

If a reactant in one reaction is the same as a product in the other then you can cancel them both. For example if 5O2 is a reactant in the first and 3O2 is a product in the second then you can subtract the difference so that in the final reaction there is 2O2 on the reactant side.

Simon Ketema_1F
Posts: 16
Joined: Wed Nov 13, 2019 12:26 am

Re: How do you combine half reactions together?

Postby Simon Ketema_1F » Sun Feb 16, 2020 11:16 pm

-You first balance non-oxygen and non-hydrogen atoms in the half-reaction.
-Once that is balanced, then add H2O to balance out the oxygen on each side.
-Then add H+ to balance the H.
-Add equal amounts of OH- on each side to neutralize the H+.
-Combine to form H2O (combine on the right side only if it is oxidation, left side only if reduction).
-Add electrons to balance out the charges.
-Add the equations together, cancel out all the e-, H2O, OH-, and H+ that you can so you get the final redox reaction.


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