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Author: Subject: electrolysis faq ^^
acx01b
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[*] posted on 17-11-2004 at 03:07
electrolysis faq ^^


hello,
i have some problems to find answers to electrolysis problems:

what is obtained after electrolysis (Pt electrodes) of 85%H2SO4 (1mol H3O+ / 1mol HSO4-) with 99% ethanol ? (h2so4 in excess)


ty by advance
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KemiRockarFett
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[*] posted on 22-11-2004 at 06:05


Quote:
Originally posted by acx01b
hello,
i have some problems to find answers to electrolysis problems:

what is obtained after electrolysis (Pt electrodes) of 85%H2SO4 (1mol H3O+ / 1mol HSO4-) with 99% ethanol ? (h2so4 in excess)


ty by advance


So you have got ethanol in sulfuric acid and as I get it you got plenty concentrated acid. The acid will act as a catalys and you will get diethylether and some ethen. The elimination to ethen goes on with temperature.
What are the meaning with electrolysis ?
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acx01b
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[*] posted on 22-11-2004 at 08:52


hello

i'm tralking about electrolysis of 1mol Ethanol with 1mol H2SO4 + 1mol H2O

we should have the C2H5OH + H2SO4 --> C2H5OHSO3 + H2O reaction isn't?

and no H2S2O8 will be formed ?

whereas without ethanol H2S2O8 will be obtained at the end

[Edited on 22-11-2004 by acx01b]
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frogfot
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[*] posted on 22-11-2004 at 11:06


The reaction you gave doesn't need electrolysis (if you meant C2H5OSO3 as final product).
Shouldn't the H2O2 formed in electrolysis just oxidise the ethanol to acetic acid..

[Edited on 22-11-2004 by frogfot]
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acx01b
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[*] posted on 22-11-2004 at 18:13


look 540-82-9

what would be obtained at the end?

acetic acid would react too...

[Edited on 23-11-2004 by acx01b]
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KemiRockarFett
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[*] posted on 24-11-2004 at 03:04


Quote:
Originally posted by frogfot
The reaction you gave doesn't need electrolysis (if you meant C2H5OSO3 as final product).
Shouldn't the H2O2 formed in electrolysis just oxidise the ethanol to acetic acid..

[Edited on 22-11-2004 by frogfot]


I think the persulphates of different kind that is created under electrolysis will react with ethanol to form acetic acid. Offcourse some of it will form peracetic acid to BUT since electricy is on much things can occur. For example will formed carboxlic acids be able to do Kolbe reactions att the anode ending up with some ethan. I will say this is a rather complex problem.

[Edited on 24-11-2004 by KemiRockarFett]
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acx01b
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[*] posted on 24-11-2004 at 16:21


http://www.google.fr/search?q=cache:rOsjDGpoNL8J:www.ylektra...

but i don't understand, they say butane will be formed with kolbe reaction, not ethane
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solo
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[*] posted on 24-11-2004 at 17:23
Ref: Electrolysis


Here is some information on the principles of electrolysis and the equations that define how it works.....solo

..........here is the Nernst Equation for Electrolysis

[Edited on 25-11-2004 by solo]




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KemiRockarFett
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[*] posted on 25-11-2004 at 02:50


Quote:
Originally posted by acx01b
http://www.google.fr/search?q=cache:rOsjDGpoNL8J:www.ylektra...

but i don't understand, they say butane will be formed with kolbe reaction, not ethane


I maybe wrong but I thought the following happend:
2CH3COO- --> 2 CH3rad + 2CO2(g) + 2e-
2 CH3rad --> C2H6(g)
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psg_man
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[*] posted on 25-11-2004 at 11:10


hey what happens if ethanol is replaced by methanol ? kolbe reaction won't happen yes?
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S.C. Wack
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[*] posted on 25-11-2004 at 13:33


It doesn't answer the question, doesn't have much experimental detail, wasn't scanned well in places, and is from 1906, but - hey, it's a free download.

http://www.archive.org/texts/texts-details-db.php?collection...

Right-click on "DjVu Download", if you already have the djvu browser plugin.
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