How to write Cell Diagrams
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Re: How to write Cell Diagrams
The basic structure of a cell diagram is (left) anode || (right) cathode, where || represents a salt bridge. You want to put the substance being oxidized on the left and and the substance being reduced on the right so that the voltage is positive. Within the left or right side, you want to write out all the substances that are there and use | to show an interface between phases in contact. So if you have copper in solid form and copper in aqueous form, you would use | to separate them.
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Re: How to write Cell Diagrams
The || represents the salt bridge and | is the interphase between phases in contact. The basic structure is cathode(REDUCTION)||anode(OXIDATION).
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Re: How to write Cell Diagrams
I would also like to add that if a porous disc/wall is replacing the salt bridge, the separation between the anode and cathode is denoted by only one "|". Also, I'm not sure if this is a strict rule, but by convention, you place the conducting electrodes on the outsides of the cell diagram and you place the reactants and products that are in solution on the insides of the cell diagram, surrounding the midline separating the cathode and the anode. This is an example from Lavelle's lecture in today: "Cu(s) | Cu2+(aq) || Fe3+(aq), Fe2+(aq) | Pt(s)" for the reaction "2 Fe3+(aq) + Cu(s) --> Cu2+(aq) + 2Fe2+(aq)".
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Re: How to write Cell Diagrams
To write a cell diagram, you must keep in mind that for convention (most of the time), the left side of the cell diagram is the anode, and the right side of the cell diagram is the cathode. You write all the solid metals (electrodes) on the outer most parts of both the left side and the right side (which means all the way on the left and right). Then depending on whether or not there are aqueous solutions, gases, or both, put those next to the solids on their respective sides, separated by one straight vertical line. To separate the two sides of the galvanic cell, you put two vertical lines.
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Re: How to write Cell Diagrams
Connie Chen 1E wrote:The basic structure of a cell diagram is (left) anode || (right) cathode, where || represents a salt bridge. You want to put the substance being oxidized on the left and and the substance being reduced on the right so that the voltage is positive. Within the left or right side, you want to write out all the substances that are there and use | to show an interface between phases in contact. So if you have copper in solid form and copper in aqueous form, you would use | to separate them.
Because the Fe3+ and the Fe2+ from the example in class yesterday are both in the aqueous phase, is that why they are only separated by a comma?
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