Balancing Redox Reactions with e-

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VictoriaRoderick_3A
Posts: 42
Joined: Fri Sep 25, 2015 3:00 am

Balancing Redox Reactions with e-

Postby VictoriaRoderick_3A » Thu Feb 04, 2016 8:28 pm

How do you know how many electrons to add?

Sarah Noorani 3L
Posts: 30
Joined: Fri Sep 25, 2015 3:00 am

Re: Balancing Redox Reactions with e-

Postby Sarah Noorani 3L » Thu Feb 04, 2016 8:52 pm

After you add all the H2O (and H+ or OH-), find the charge on both sides of the reaction. For example, consider the reaction
Cl2 + 2H2O --> 2HClO + 2H+
The reactant side has a total charge of 0 (because the Cl2 and H2O are neutral) while the product side has an overall charge of +2 (because of the 2 hydrogen ions). To balance the charge, you would have to add 2 electrons to the product side to cancel the +2 charge. Once you do that, the charge on both sides will be 0.


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