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engkabang.net > Forum > Sijil Pelajaran Malaysia > 4541 Chemistry (Moderator: Jong Kah Yin) > Electrolysis overall equation?
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Lim Tze Khai
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« on: May 05, 2009, 10:15:41 AM »
Electrolysis of molten PbBr2 with carbon electrode

   Anode: 2Br- --> Br2 +2e
   Cathode: Pb2+ + 2e --> Pb
   Overall:
Option 1: Pb2+ + 2Br- --> Pb + Br2

or

Option 2: PbBr2 --> Pb + Br2
   
Which is your answer???
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LIM TZE KHAI
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Ting Tin Chung
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« Reply #1 on: May 05, 2009, 10:21:05 AM »
Quote from: Lim Tze Khai on May 05, 2009, 10:15:41 AM
Electrolysis of molten PbBr2 with carbon electrode

   Anode: 2Br- --> Br2 +2e
   Cathode: Pb2+ + 2e --> Pb
   Overall:
Option 1: Pb2+ + 2Br- --> Pb + Br2

or

Option 2: PbBr2 --> Pb + Br2
   
Which is your answer???

Normally when we talk about overall equation, it's involve the ions in the equation....
My answer is refer to option 1.... never seen the equation in option 2....
If i'm wrong, please let me know... Wink
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Ting Tin Chung
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Lim Tze Khai
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« Reply #2 on: May 05, 2009, 10:29:13 AM »
Correction!!!!!

Electrolysis of molten PbBr2 with carbon electrode

   Anode: 2Br- --> Br2 +2e
   Cathode: Pb2+ + 2e --> Pb
   Overall:
Option 1: Pb2+ + 2Br- --> Pb + Br2

or

Option 2: PbBr2 --> Pb + Br2
   
Which is your answer???
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Ting Tin Chung
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« Reply #3 on: May 05, 2009, 12:21:14 PM »
i still prefer option 1.....
« Last Edit: May 10, 2009, 09:10:36 PM by Ting Tin Chung » Logged
Liew Hui Lee
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« Reply #4 on: May 10, 2009, 08:38:45 PM »
Only Option 1 is accepted.  Normally, during writing overall equation, we combine both the half-equation by cancel out the electrons.  If both half-equation have unequal number of electrons, we must make their number of electrons equal by multifly with a coefficient...
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« Reply #5 on: May 16, 2009, 09:00:46 PM »
Same goes for me, option 1 is my choice.
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Choo Yih Teen
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« Reply #6 on: May 20, 2009, 01:57:16 PM »
i usually teach my class option 1, which is easier to explain...

anyway, i manage to find this web page, http://www.gcsescience.com/ex5.htm which written option 2 as overall reaction.

what do you think?  Wink
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Choo Yih Teen
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