Writing the Cell Reaction from the Cell Diagram

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JamieVu_2C
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Joined: Thu Jul 25, 2019 12:16 am

Writing the Cell Reaction from the Cell Diagram

Postby JamieVu_2C » Sun Feb 23, 2020 7:42 pm

How would you write the reaction equation from the given cell diagram? For example, how would you write the reaction for
Zn(s)|(aq)||(aq)|Cu(s)?

Jessica Castellanos
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Re: Writing the Cell Reaction from the Cell Diagram

Postby Jessica Castellanos » Sun Feb 23, 2020 7:54 pm

Since the Zn reaction is on the left side, it is the anode so it is going through oxidation (losing electrons), so start off by writing down the reaction for the left hand side as Zn(s) to Zn^2+(aq)+2e-
On the right side is the Cu reaction which is the cathode so it is undergoing reduction (gaining electrons), so that reaction can be written as Cu^2+(aq)+2e- to Cu(s).
Since the atoms for the half reactions are balanced, the next step is to balance the electron transfer by simply adding the two half reactions together to cancel out the 2 electrons (they are on opposite sides of the reaction).


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