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Topic: Electrochem-Galvanic cells  (Read 5762 times)

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777888

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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 »
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Offline Donaldson Tan

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Re:Electrochem-Galvanic cells
« Reply #1 on: October 27, 2004, 01:44:22 PM »
Quote from: 777888 on October 26, 2004, 06:07:59 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.

Quote from: 777888 on October 26, 2004, 06:07:59 PM
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.
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777888

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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?
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