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It's because the whole point of your solid electrode is that it can conduct electricity (movement of electrons) which only metals can effectively do. So will you do have a solid, iodine cannot be the electrode because it is not a metal
EMurphy_2L wrote:in 6L.5) part b) why do you add Pt as a solid for the Iodine anode reaction? You are already given the solid I2(s) so why to you need an inert conductor?
While I2 is a solid, it is not a metal. The electrode needs to be a solid metal to conduct electricity. Therefore solid platinum metal (Pt) is used. If no solid metal is present, you are required to use platinum as the electrode according to traditional electrochemistry rules. The only exception I know of is liquid mercury (Hg) which can be used to conduct electricity. I hope this helps!
It is because you need a solid METAL. I2 is not a metal, so you need to add a metal, because you need something to conduct the electrons (metals are able to do this because of metallic bonding, if you remember from Chem 14a, the "sea of electrons" )
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