Finding n for redox reaction (2013 Final Question 4A)

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Kevin Neumann 1A
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Joined: Fri Sep 25, 2015 3:00 am

Finding n for redox reaction (2013 Final Question 4A)

Postby Kevin Neumann 1A » Tue Mar 08, 2016 11:08 pm

Given reaction is 2Fe(s)+2H20(l)+02(aq) --> 2Fe(OH)2(s), with E=+0.84 V.
It then gives data on the two droplets and their concentrations/E.
Part A asks to find the reaction quotient Q for each droplet after 100s.
I know you use the equation Ecell=Ecell-RT/nF lnQ, but how do you find n? The solution just says n=4, but it's unclear why n=4 in this case.
Last edited by Kevin Neumann 1A on Wed Mar 09, 2016 12:13 am, edited 1 time in total.

Cindy Chen_2I
Posts: 43
Joined: Wed Nov 18, 2015 3:00 am

Re: 2013 Final Question 4A

Postby Cindy Chen_2I » Tue Mar 08, 2016 11:17 pm

There are 2 Fe going to Fe2+. 2* (2-0)=4.That makes four.

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