Standard Potentials

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205389184
Posts: 100
Joined: Sat Sep 07, 2019 12:18 am

Standard Potentials

Postby 205389184 » Tue Mar 03, 2020 9:50 pm

If the cell potential isn't explicitly given, how do we calculate for it? For example, in 6M 3. (a) Pt(s)|Cr3+ (aq),Cr2+ (aq)||Cu2+ (aq)|Cu(s), the cell potential for Cr is not in the tables of potential values provided, so how do we go about problems like these?

Julie Park 1G
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am

Re: Standard Potentials

Postby Julie Park 1G » Tue Mar 03, 2020 10:06 pm

The potential involving Cr2+ and Cr3+ is provided in appendix 2B of the textbook! (:
According to the textbook, the standard reduction potential of Cr3+ + e- = Cr2+ has a value of of -0.41V

205291012
Posts: 50
Joined: Mon Nov 11, 2019 12:17 am

Re: Standard Potentials

Postby 205291012 » Tue Mar 03, 2020 10:29 pm

You need to find the species from your redox reaction in the appendix 2B and use those potential values.


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