Cell Diagrams

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Jessica Helfond 2F
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Joined: Fri Sep 28, 2018 12:16 am

Cell Diagrams

Postby Jessica Helfond 2F » Mon Feb 25, 2019 6:28 pm

How do you know what order to put the reactants and products in when constructing a cell diagram?

Posts: 68
Joined: Fri Sep 28, 2018 12:27 am

Re: Cell Diagrams

Postby alanaarchbold » Mon Feb 25, 2019 7:13 pm

It's more based on the anode and cathode. So say you have Cu2+(aq) + 2Cr2+ (aq) ---> 2Cr3+(aq) + Cu(s). Since the Cr is the one losing electrons, it will be on the anode side and since Cu is gaining electrons, it will be on the cathode side. So it will look like: Pt(s) | Cr3+, Cr2+(aq) || Cu2+(aq) | Cu(s). The solids are on the outside and ions on the inside. Since the anode side doesn't have a solid, we can use platinum because it's a neutral solid.

Angela Grant 1D
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Joined: Fri Sep 28, 2018 12:25 am

Re: Cell Diagrams

Postby Angela Grant 1D » Mon Feb 25, 2019 7:36 pm

^to add on, within each half-reaction in a cell diagram, you'd typically write in the order of what's being reduced/oxidized. so if Ni2+ is reduced to Ni, the cell diagram for this cathode would be Ni2+(aq)|Ni(s)

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