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There are also cases in which a Pt electrode is necessary even if one of the species is not in solution. Such an example includes I2 (s). Because it isn't a metal and is a poor conductor of electricity, it is necessary to have a Pt electrode in this case even if the species is a solid. On the opposite end of the spectrum, there are some cases in which a Pt electrode is unnecessary even if the species is a liquid as in the case of mercury (Hg (l)), which is a liquid metal capable of conducting electricity at standard temperature and conditions.
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