April 27, 2024, 08:06:44 PM
Forum Rules: Read This Before Posting


Topic: Calculating the potential  (Read 3360 times)

0 Members and 1 Guest are viewing this topic.

Offline tiny101

  • Regular Member
  • ***
  • Posts: 22
  • Mole Snacks: +0/-1
Calculating the potential
« on: July 14, 2008, 09:47:53 PM »
This is the exact way the problem is in my lab manual:

Calculate the potential for:
Cu | CuSO4 (0.050M) || CuSO4 (1.0M) | Cu

I'm not sure if the || indicates that on either side is a half cell... or what else it may mean? Any help would be much appreciated!

Thanks in advance.

Offline enahs

  • 16-92-15-68 32-7-53-92-16
  • Retired Staff
  • Sr. Member
  • *
  • Posts: 2179
  • Mole Snacks: +206/-44
  • Gender: Male
Re: Calculating the potential
« Reply #1 on: July 14, 2008, 10:38:30 PM »
The || indicates a salt bridge.
The | indicates a phase boundary.


http://www.science.uwaterloo.ca/~cchieh/cact/c123/battery.html


Offline tiny101

  • Regular Member
  • ***
  • Posts: 22
  • Mole Snacks: +0/-1
Re: Calculating the potential
« Reply #2 on: July 14, 2008, 11:48:30 PM »
Thanks very much for the information.

However, in trying  to solve the problem I've encountered another problem:

to find the potential of this, I should use the equation: Ecell = E(cathode) - E(anode)? However, if I do that, I totally disregard the concentrations that are provided... which doesn't seem right. Also, I've tried the nernst equation -> E = E(initial) - (RT/nF) * ln([anode]/[cathode]), but I don't know E(initial). How else should I go about this?

Offline vhpk

  • Full Member
  • ****
  • Posts: 259
  • Mole Snacks: +12/-25
  • Gender: Male
Re: Calculating the potential
« Reply #3 on: July 14, 2008, 11:53:44 PM »
Thanks very much for the information.

However, in trying  to solve the problem I've encountered another problem:

to find the potential of this, I should use the equation: Ecell = E(cathode) - E(anode)? However, if I do that, I totally disregard the concentrations that are provided... which doesn't seem right. Also, I've tried the nernst equation -> E = E(initial) - (RT/nF) * ln([anode]/[cathode]), but I don't know E(initial). How else should I go about this?

E(inital) is the difference of 2 E0 of cathode and anode:
E(initial) =  E0(Cathode) - E0(anode)
In this case, it's = 0 due to the same standard electrode potential
Genius is a long patience

Sponsored Links