Elementary Steps

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Elementary Steps

Postby lizettelopez1F » Sat Mar 16, 2019 11:30 pm

Why can we not add the cell potential of elementary steps?

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Re: Elementary Steps

Postby Chem_Mod » Sat Mar 16, 2019 11:48 pm

I think what you're referring to is that when you have to calculate the E value for a reaction like this: Ti+4 + 2e- -> Ti+2, you cannot simply add the E values for the reactions Ti+4 + e- -> Ti+3 and Ti+3 + e- -> Ti+2.

The details about why this happens aren't too important, but this is a good general rule: If the reaction you're calculating the E value for has electrons in it, you cannot simply add the E values from the 2 reactions needed to make that reaction. If the reaction you're calculating the E value for does not have electrons in it, you can simply add the E values. :)

Kassidy Ford 1I
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Re: Elementary Steps

Postby Kassidy Ford 1I » Wed Mar 11, 2020 1:42 pm

Also, cell potential only refers to electrochemistry, more specifically redox reactions. In kinetics, elementary steps are used to find the reaction mechanism that matches the rate law... they usually wont have a given cell potential as these are usually not reduction or oxidation reactions.

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