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### Conducting Solids

Posted: Mon Feb 06, 2017 5:48 pm
Earlier Dr. Lavelle, spoke of some reactions that have not conducting solids. Can someone explain the reasoning behind this again?

### Re: Conducting Solids

Posted: Mon Feb 06, 2017 8:57 pm
When you are dealing with a half reaction such as Cu+2(aq) + 2e- $\rightarrow$ Cu(s), the copper solid becomes our electrode. However, when we deal with a half reaction in which both the products and reactions are not in the solid state, such as Fe+3(aq) + 1e- $\rightarrow$ Fe+2(aq), we must use an inert electrode like Platinum (Pt).

To summarize, when you have a solid, use that as your electrode. When you only have gasses or aqueous, use Pt as your electrode.