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Author Topic: Electrolysis  (Read 3587 times)

j9sully

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Electrolysis
« on: 20/04/2004 17:31:04 »
I need to explain what would occur when the following substances are electrolysed:

molten Kbr
molten Al(2)O(3)
Nal solution
dilute sulphuric acid

i know they split, one goes to anode, one to cathode but i think one or two of them leave a substance free.......any help would be welcome

Many thanks

CsManiacDan

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Re: Electrolysis
« Reply #1 on: 20/04/2004 19:43:51 »
Hi J9sully!

Correct me if i'm wrong but i think this is what KBr would do:

Potassium has a valency of +1 so it goes to the negative electrode (cathode), the bromine would go to the other.

Al(2)O(3)
The aluminium has a +3 Valency so would go to the Cathode and the oxygen would go to the anode.

The Nal I assume means NaCl
Sodium has a valency of +1 so would go to the Cathode and The chlorine would go to anode

That's all I'm sure and it's been a while since I did this so if anyone knows better please feel free to point it out!

I Love Caesium!!!
« Last Edit: 20/04/2004 19:44:20 by CsManiacDan »

ruthenium

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Re: Electrolysis
« Reply #2 on: 20/04/2004 20:06:07 »
About dilute sulphiric acid, on Cathode would develop hydrogen, on Anode xygen

j9sully

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Re: Electrolysis
« Reply #3 on: 21/04/2004 12:54:30 »
Thanking you both for your very valuable replies....it all makes complete sense and has done me a huge favour....thanks again!!!

8D

nilmot

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Re: Electrolysis
« Reply #4 on: 21/04/2004 13:00:24 »
I think depend on the electrodes you use the product formed might be different. Like with O2 moves toward the anode, if anode is made of carbon, then CO2 will be produced. Or I could be just talking ____ here

Tom

chris

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Re: Electrolysis
« Reply #5 on: 21/04/2004 22:50:59 »
Yeah, you're a bit confused there. You'll only make CO2 in the presence of oxygen if the temperature is sufficiently high to make the two react. At room temperature the carbon is inert and the oxygen is released as bubbles.

Chris

"I never forget a face, but in your case I'll make an exception"
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nilmot

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Re: Electrolysis
« Reply #6 on: 22/04/2004 09:49:55 »
Mmm...but if you are to get aluminium oxide molten , won't the temperature be high , very high in the first place anyway?

Tom

cuso4

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Re: Electrolysis
« Reply #7 on: 22/04/2004 10:45:58 »
Yep very high. About 2000 degrees C. Cryolite (sodium aluminium fluoride, Na3AlF6) act as a solvent in Al2O3 and reduce the melting point to about 1000 degrees C.

Angel

taylorjdfan

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Re: Electrolysis
« Reply #8 on: 22/04/2004 16:26:32 »
Hey, i fault i had a reply then n got al xcited!!!

I aint having n e luck either!!! Dont fink it will b dun by 2muro, how much u dun!!!!

 

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