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Katie Bart 1I wrote:In a redox reaction, how do you know how many electrons to add to each part of the reaction? And how do you know which side of the equation to add them on?
Add electrons to the side of the equation with the greater positive charge. To determine how many electrons to add to each part of the reaction, calculate the overall charge of each side of the reaction. Subtract the overall charge from one side from the other side's overall charge. This difference represents how many electrons you should add to the side of the equation with the greater positive charge.
Once you determine the side electrons must go on for one of the half rxns, you can know to place the electrons on the opposite side of the other half rxn equation since the electrons must cancel as the equations are added.
You add electrons to the reactant side of reduction reactions because that substance is gaining electrons. Conversely, you add electrons to the product side of oxidation reactions since that substance is losing electrons.
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