[CHM 112] Burdge

[Andrew J. Pounds]

On 07/25/13 01:27, wrote:
>
> Dr. Pounds,
>
> I was reading Burdge chapter 19 and had a problem with the sample 
> problems.
>
> In sample problem 19.4 and 19.6, I thought the cathode would be the Au 
> and Co respectively but in the book these were described to be anodes.
>
> I thought cathodes had a greater or more positive reduction potential
>
> Thank you.
>

In these sample problems they explicitly gave you the chemical equation 
for the reaction that they want you to consider -- they did not say 
"write it so it is spontaneous" like we did in class.   In fact, the way 
they wrote the reactions is not spontaneous ($\Delta G$ is positive).

Because Gold is being oxidized in the reaction they gave you, it is the 
anode in this case.

-- 
Andrew J. Pounds, Ph.D.  (pounds_aj at mercer.edu)
Professor of Chemistry and Computer Science
Mercer University,  Macon, GA 31207   (478) 301-5627
http://faculty.mercer.edu/pounds_aj

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