kronos
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crazy foam while synthesizing copper (II) acetate
Like everyone i also want to make a beautiful collection of colourfull copper compounds.. in India we have a very limted access to very limited number
of OTC reagents.. So i got some food grade vineger, Copper wires and 20volume hydrogen peroxide(6%).. And mixed equal volumes of vineger and hydrogen
peroxide and dumped a good amount of copper wires.. After 1hr saw the container in which i was making the compound was overflowing with a strange
thick foam which was totally determined not to go away, the top of the foam was brown but the rest was white .. After dumping the foam somehow though i found the solution to be black instead of a beautiful blue.. Sad.. I
cannot guess at all what is going on here... Please help me out..  
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Zombie
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Distilled White Vinegar or some other sort?
They tried to have me "put to sleep" so I came back to return the favor.
Zom.
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kronos
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Distilled white vineger yes...5% concentration
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Molecular Manipulations
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A lot of times they distill vinegar and then add sugars to it afterward, but they still call it distilled. Evaporate a few mLs of your vinegar and see
if there's any solids left.
I'm guessing some organic got oxidized by your peroxide and the foam is mostly carbon dioxide and catalyticly released oxygen.
[Edited on 21-2-2015 by Molecular Manipulations]
-The manipulator
We are all here on earth to help others; what on earth the others are here for I don't know. -W. H. Auden
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kronos
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Okay thanx for the advice... I will try evaporating a bit and ghen i will post the results.. 
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kronos
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okay.. I just evaporated half a cup of my said distilled white vineger... And there was no residue left at all at the bottom of my container.. Now
what ahould i do
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Molecular Manipulations
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Actually it appears I was partially wrong. While sugars are sometimes added to "distilled" vinegar, apparently it's not even distilled in the first
place. From Wikipedia:
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The term "distilled vinegar" is something of a misnomer, because it is not produced by distillation but by fermentation of distilled alcohol
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Thus the list of volatile impurities is longer than I thought.
So even if your vinegar has no added solids doesn't mean it has no other impurities. If you can distill it, I'd try that. Otherwise try another brand.
-The manipulator
We are all here on earth to help others; what on earth the others are here for I don't know. -W. H. Auden
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kronos
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Okay.. Thanks a lot.. After thinking about what you said... I remembered that previously this thing did not happen with the brand i used earlier..
So I think I need revert back to that brand ...
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blogfast25
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The black may be due to a mixed valence compound Cu(I)/Cu(II). The type of complex has been described somewhere on this forum. It's dark brown.
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kronos
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No i found that the darkness of that solution was due some dark particles... Now what the heck is that.. And yes i collected some of that foam and
added HCl and it bubbled vigorously and disappeared.. What is going on here ???
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blogfast25
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Quote: Originally posted by kronos  | | No i found that the darkness of that solution was due some dark particles... Now what the heck is that.. And yes i collected some of that foam and
added HCl and it bubbled vigorously and disappeared.. What is going on here ???
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The bubbling is almost certainly due to peroxide + HCl.
The black specks might be CuO. If pH dropped a lot then Cu(OH)2 might have formed. With some heat that dehydrates very quickly to black CuO. Any heat
used?
[Edited on 23-2-2015 by blogfast25]
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kronos
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Nope no heat used at all.. Rather the vineger was a little cool.. It came out from the fridge.. And i used after the temperature came nepar room
temperature
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