how to balance

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how to balance

Postby Noh_Jasmine_1J » Wed Feb 20, 2019 3:52 pm

do you balance redox rxns by oxidation number or stoichiometry?

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Re: how to balance

Postby AdityaGuru1H » Wed Feb 20, 2019 3:56 pm

you will balance it like we have been doing it before(making sure the charges balance and matter stays the same), but you will use oxidation numbers to figure out where the charges change in the reaction

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Re: how to balance

Postby Felicia1E » Wed Feb 20, 2019 4:15 pm

Yeah, so you would have to take both into consideration. In the end, not only does the number of moles of each element have to be the same, the charges on each side also have to be the same. For example, in the redox reaction (Zn) + (Ag^+) ---> (Zn^2+) + (Ag), it might seem that there is one mole of each element on both sides, but taking into account the charges are not balanced. Therefore, to balance it, you would look at the half reactions and determine that the correctly balanced equation is (Zn) + (2Ag^+) ---> (Zn^2+) + (2Ag).

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Re: how to balance

Postby chaggard » Wed Feb 20, 2019 4:18 pm

You will be combining both, however figuring out oxidation numbers such as the example in class today with Manganese being reduced from +7 to +2 allows us to figure out the stoichiometric number for iron being 5. 5Fe^2+-->5Fe^3+ + 5e-

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Re: how to balance

Postby hazelyang2E » Wed Feb 20, 2019 4:19 pm

I believe Professor Lavelle also mentioned in lecture today that when you balance out the reaction using stoichiometric methods, the oxidation numbers will usually balance out as well. In addition to balance out the charges you can add electrons to either the reactants or products side of the reaction.

Samantha Chang 2K
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Re: how to balance

Postby Samantha Chang 2K » Wed Feb 20, 2019 4:45 pm

For redox reactions you have to do both, balance, like we learned in high school, and make sure the charges are even.

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