Cell diagrams and solids
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Cell diagrams and solids
In a cell diagram, when do you include a solid and why do we have to include a solid? Also, Is the solid always going to be Pt(s)?
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Re: Cell diagrams and solids
There always needs to be a conducting solid so that there is a path for the electrons to move across. The solid is only Pt (s) when none of the species in the half reaction are a solid conducting metal.
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Re: Cell diagrams and solids
So if there is a solid in the reaction then you don't include Pt at the end?
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Re: Cell diagrams and solids
Henry Dudley 1G wrote:So if there is a solid in the reaction then you don't include Pt at the end?
If the elements undergoing redox reactions are present in solid form (electrodes composed of those elements), then a conducting solid such as platinum is not needed however if if they are not in solid form, rather in a gaseous or aqueous state, the reaction will require a conducting solid.
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Re: Cell diagrams and solids
More often than not the solid used is going to be platinum but you can also use graphite as a conducting solid
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Re: Cell diagrams and solids
If there is a solid or liquid (like Hg (mercury)), an inert solid like Pt(s) is not needed
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Re: Cell diagrams and solids
Usually an inert solid like Platinum is added when a solution does not already have a conducting solid.
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Re: Cell diagrams and solids
The electrons can not be conducted by themselves therefore an inert solid like Platinum could be used to transfer the electrons over to the other side.
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Re: Cell diagrams and solids
You would want a metal solid to be the electrode. Pt(s) is inert so it's the usual go-to.
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