Different electrodes

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Different electrodes

Postby ShravanPatel2B » Fri Mar 13, 2020 9:22 am

When writing cell diagrams how do we know what type of electrode to add to either anode or cathode. There are Platinum electrodes and sometimes carbon is written in the form C(gr)? what is the explanation behind this?

William Chan 1D
Posts: 102
Joined: Sat Sep 14, 2019 12:15 am

Re: Different electrodes

Postby William Chan 1D » Fri Mar 13, 2020 9:52 am

If there is solid metal in the redox reaction (like Cu), then that can be used as the anode or cathode. If there is no solid metal (like Fe3+ to Fe2+), then a nonreactive metal like C (graphite) or Platinum should be used.

Emma Popescu 1L
Posts: 105
Joined: Wed Sep 11, 2019 12:16 am

Re: Different electrodes

Postby Emma Popescu 1L » Fri Mar 13, 2020 8:33 pm

An inert electrode (Pt) should be used if the reactants cannot act as an electrode. For example, if you have ions or gases then Pt is needed. However, if you have a solid metal, then it can be used as the electrode.

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