Chemical Forums

Please login or register.

Login with username, password and session length

Sponsored links

Pages: [1]   Go Down

Author Topic: Electrochemistry and potential difference  (Read 5290 times)

0 Members and 1 Guest are viewing this topic.

odicon

  • Regular Member
  • ***
  • Mole Snacks: +0/-1
  • Offline Offline
  • Posts: 26
Electrochemistry and potential difference
« on: February 27, 2010, 05:04:21 PM »

At 37oC the concentration of Fe3+ inside a cell is 0.082 M and outside is 0.016 M . The cell membrane is permeable to Fe3+. What potential difference in volts would have to exist across the membrane for Fe3+ to be in equilibrium at the stated conditions? Give you answer as the absolute value of the potential difference in volts.


Sorry if this is an easy question... but I do not quite know which equation I should be using for this one. Thanks a lot.
Logged

Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Mole Snacks: +1628/-395
  • Online Online
  • Gender: Male
  • Posts: 24876
  • I am known to be occasionally wrong.
    • Chembuddy
Re: Electrochemistry and potential difference
« Reply #1 on: February 27, 2010, 10:27:59 PM »

Nernst.
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info, PZWT_s1

odicon

  • Regular Member
  • ***
  • Mole Snacks: +0/-1
  • Offline Offline
  • Posts: 26
Re: Electrochemistry and potential difference
« Reply #2 on: February 28, 2010, 07:05:00 PM »

Hi Borek,

Thanks a lot for your response!
I would really really appreciate it if you could help me set up Nernst equation for this one?

I set it as:

Delta E = RT/nF * ln([Fe3+ out]/[Fe3+ in])

and plugged in the values and got 0.0437 but the correct answer is 0.01459 so it must be wrong.

FYI
I plugged in:
R = 0.08206
T = 310
n = 1
F = 96485
[Fe3+ out] = 0.082
[Fe3+ in] = 0.016


but I am so lost.

Thanks a lot.
Logged
Pages: [1]   Go Up
 

Mitch Andre Garcia's Chemical Forums 2003-Present.

Page created in 0.046 seconds with 20 queries.