Midterm 2014 Question 8

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Steph S 2F
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Joined: Fri Sep 26, 2014 2:02 pm

Midterm 2014 Question 8

Postby Steph S 2F » Tue Feb 09, 2016 9:14 pm

In this question, the half reaction with the greater reduction potential was chosen as the anode. However, isn't the half reaction with the larger reduction potential supposed to be the cathode?

Irena Roy 4H
Posts: 40
Joined: Fri Sep 25, 2015 3:00 am

Re: Midterm 2014 Question 8

Postby Irena Roy 4H » Tue Feb 09, 2016 9:52 pm

In this case we are trying to obtain the equation 2HF(aq) --> 2H+(aq) + 2F-(aq) in order to find it's Ka. In order to get this equation, the equation with the +3.03 V can't be the cathode, it needs to be the anode. By designating it as the anode half reaction, we'll then flip it accordingly, which will give us HF on the left side side of the overall reaction.

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