April 11, 2021, 05:20:53 AM
Forum Rules: Read This Before Posting


Topic: Electrochem-Galvanic cells  (Read 4696 times)

0 Members and 1 Guest are viewing this topic.

777888

  • Guest
Electrochem-Galvanic cells
« on: October 26, 2004, 06:07:59 PM »
I have some questions about the galvanic cells.

1)Would the cell notation of an Iron(III)-hydrogen standard cell be  Fe(2+)|Fe(3+)||H(+)|H2 ??

2)And also, why do we write cell notation involving hydrogen ions this way Pt|H(+),H2... ? Why is there Pt as elctrode while not in the half reactions?

3)Why would the electrode that electrons flow to be the cathode(positive)? Should the electrons make it more "negative"?

4)Besides, can someone help me with the problem in other 2 posts...I am confused
Please read the last replies,
http://www.chemicalforums.com/index.php?board=4;action=display;threadid=1312
http://www.chemicalforums.com/index.php?board=4;action=display;threadid=1291

Thank you very much! :)
« Last Edit: October 26, 2004, 08:59:32 PM by 777888 »

Offline Donaldson Tan

  • Editor, New Asia Republic
  • Retired Staff
  • Sr. Member
  • *
  • Posts: 3178
  • Mole Snacks: +261/-13
  • Gender: Male
    • New Asia Republic
Re:Electrochem-Galvanic cells
« Reply #1 on: October 27, 2004, 01:44:22 PM »
2)And also, why do we write cell notation involving hydrogen ions this way Pt|H(+),H2... ? Why is there Pt as elctrode while not in the half reactions?
The electrode only acts as a pathway for electrons to flow within the electrical circuit. It is not directly involve in the chemical reaction, ie. what's happening inside the aq medium.

3)Why would the electrode that electrons flow to be the cathode(positive)? Should the electrons make it more "negative"?
electron from low potential to high potential. moreoever, electrons are attracted to positive charge. if electrons were to flow towards an electrode, that electrode must be positive.
"Say you're in a [chemical] plant and there's a snake on the floor. What are you going to do? Call a consultant? Get a meeting together to talk about which color is the snake? Employees should do one thing: walk over there and you step on the friggin� snake." - Jean-Pierre Garnier, CEO of Glaxosmithkline, June 2006

777888

  • Guest
Re:Electrochem-Galvanic cells
« Reply #2 on: October 27, 2004, 04:19:36 PM »
Thanks :)

For this problem, "Would the cell notation of an Iron(III)-hydrogen standard cell be  Fe(2+)|Fe(3+)||H(+)|H2 ??"
Can Fe(2+) be an electrode? Or is this cell notation (Fe(2+)|Fe(3+)||H(+)|H2) correct?

Sponsored Links