[Ipodlover]

Electrogravimetry

Cu2+(aq) + 2e− → Cu(s)   E° = 0.339 V

O2(g) + 2H+(aq) + 2e− → H2O(l)   E° = 1.2291 V

S2O82−(aq) + 2e− → 2SO42−(aq)   E° = 2.01 V

The amount of copper in a Cu2+/H2SO4 solution is to be determined by electrogravimetry. If the cuprate concentration is initially [Cu2+] = 0.001500 M, what would be the ideal cathodic potential versus SHE when 99.7% of the possible copper metal has been deposited?

Im not even too sure on how to start..

2): Ideally, what voltage must be applied to a platinum-electrode electrolytic cell containing this solution at pH=1.78 in order to obtain this degree of deposition?


If anyone can give me a hand I will appretiate it.

[Borek]

The amount of copper in a Cu2+/H2SO4 solution is to be determined by electrogravimetry. If the cuprate concentration is initially [Cu2+] = 0.001500 M, what would be the ideal cathodic potential versus SHE when 99.7% of the possible copper metal has been deposited?

What will be the final concentration of Cu²⁺ after deposition? What is Nernst potential of Cu/Cu²⁺ for this concentration?

[alo159]

Well..basically what you have to do is this...you first have to find out the concentration of Cu after 99.7% of it has been reduced... once you get that, then plug in the number into the Nernst equation... it would look like this:         
0.339-0.05916/2 log(1/concentration of Cu)=E and the concentration of Cu is calculated from above....hope this helps...still trying to figure out part 2

[DUDE778]

i had this question and this really helped, thanks

[alo159]

just wondering..do most of you guys go to SFU??? cause we seem to have the same questions at the same time..lol