Pt in a cell diagram

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Pt in a cell diagram

Postby Saachi_Kotia_4E » Mon Feb 25, 2019 10:49 am

how do you know when you need to add Pt in the cell diagram? I thought it was when everything on one side of the diagram was in the same phase, but there was one example in the textbook that had solid and aqueous iodine which still had platinum. so how do you know if it needs platinum?

Grace Kim 1J
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Re: Pt in a cell diagram

Postby Grace Kim 1J » Mon Feb 25, 2019 12:05 pm

Pt is added when there is no conducting metal available to carry the electrion and lacks a solid conductor. For example, if one half-reaction consists only of aqueous species, then that sides needs Pt(s).

In the textbook problem, the half-reaction of I2(s) / I- (aq) requires Pt(s) because I2(s) is a non-conducting solid.

Hope this helped!

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