Favoring reactions

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Emily Lo 1J
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Joined: Thu Sep 19, 2019 12:16 am

Favoring reactions

Postby Emily Lo 1J » Thu Mar 05, 2020 2:34 pm

If the anode has a larger value than the cathode, does the reaction favor the products? Does it have to be the cathode that is a larger value for the reaction to favor the products? And is this something we should know?

Jacey Yang 1F
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Re: Favoring reactions

Postby Jacey Yang 1F » Fri Mar 06, 2020 12:19 am

The reaction will favor the reactants if the anode has a larger value than the cathode, because the overall cell potential will be negative, so delta G will be positive.

Subashni Rajiv 1K
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Re: Favoring reactions

Postby Subashni Rajiv 1K » Fri Mar 06, 2020 12:23 am

Looking at the Nernst Equation and how the variables related to one another can help you understand the effect of anode/cathode differences.

Sanjana Borle 2K
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Re: Favoring reactions

Postby Sanjana Borle 2K » Fri Mar 06, 2020 12:27 am

Using the equation deltaG=-nfE(naught), if E(naught) is calculated using E(cathode)-E(anode), and E anode is bigger, this means that the total cell potential will be negative. Since negative times negative is positive, delta G is positive, which tells us that the forward reaction is not favored, but rather the reverse.

chimerila
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Re: Favoring reactions

Postby chimerila » Fri Mar 06, 2020 12:56 am

For nonstandard cell potentials, looking at the proportions of products and reactants when calculating Q can also help you determine which direction the reaction favors. For example, if Q is a large number (so there would be a lot of product in proportion to reactants), it would be a product favored system. If Q is a small number (so there would be a lot of reactant), it would be a reactant favored system.

Jialun Chen 4F
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Re: Favoring reactions

Postby Jialun Chen 4F » Fri Mar 06, 2020 1:23 am

In this case, the reverse direction or reactant side is favored since the reaction is spontaneous when Ecellnaught is positive.

205389184
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Joined: Sat Sep 07, 2019 12:18 am

Re: Favoring reactions

Postby 205389184 » Sun Mar 08, 2020 11:34 pm

The forward reaction will be favored if delta G is negative and vice versa

ramiro_romero
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Re: Favoring reactions

Postby ramiro_romero » Sun Mar 08, 2020 11:36 pm

Correct, if the anode value is larger than the cathode, the reactants/ reverse reaction will be favored. You should also know that this means a negative cell potential, and a positive delta G


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