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Cell Diagrams

Posted: Wed Feb 27, 2019 2:42 pm
by Nathan Mariano 2G
Does the order of the species in the cell diagrams matter? Besides the fact that the right side is the cathode and the left side is the anode.

Re: Cell Diagrams

Posted: Wed Feb 27, 2019 3:05 pm
by Chris Freking 2G
Conducting solids (electrodes) should be on the outside of the cell, and aqueous should be on the inside next to the salt bridge.

See viewtopic.php?f=140&t=43085

Re: Cell Diagrams

Posted: Wed Feb 27, 2019 3:07 pm
by Nathan Mariano 2G
Does the order of the species inside of the anode and cathode matter? For example, is the species before oxidation placed first and the species after it has been oxidized placed next?

Re: Cell Diagrams

Posted: Wed Feb 27, 2019 3:11 pm
by David Effio 1H
Yes, the order matters, as on the outside are the material of the cathode and anode, while on the inside, connected by the salt bridge represented by a || are the ions of the two materials, which will be balancing the charges to assure that the reaction doesn't all occur at once and the battery reaches equilibrium within a few seconds of the reaction starting. The materials right next to the salt bridge should always be the ions that will be transferred through the salt bridge.

There will be times when there are multiple compounds divided by a |, in which case, the compounds further on the left and right sides are the materials of the cathode and anode, which usually do not interact with the materials in the solution, such as the Pt (s) cathode or anode, which serves only to transfer electrons but isnt actually affected by the solution or the electron transfer.

Keep in mind, of course, that the cathode and the anode can be written on opposite sides (watch out for that perhaps for testing purposes), where the voltage will be the opposite (-) of what it would be normally.

Re: Cell Diagrams

Posted: Wed Feb 27, 2019 3:21 pm
by Arta Kasaeian 2C
Usually it's preferred that the aqueous ions need to be next to the salt bridge. and there's separation with one line between the aqueous objects and the solid ones, which are put on the outside of the diagram. If the cathode/anode reaction doesn't include a solid, we put solids such as Pt(s) to facilitate the current.