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bonemachine
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Can't make CuO
I have trouble making CuO with electrolysis. Can anyone describe a method?
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the_describer
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CUO
Can you tell me the sense to make CuO by
electrolysis !
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bonemachine
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oxigen produced from cathode will combine with Cu. That's what i thought but it doesn't work.... Now can you help?
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madscientist
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You'll get the blue insoluble Cu(OH)2. Filter it out, and heat it strongly, to get the black CuO.
I weep at the sight of flaming acetic anhydride.
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bonemachine
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Is it dangerous to heat it or to handle it with bare hands? Both Cu(OH)2 and Cu?
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bonemachine
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While electolising water with Cu electrodes it turned blue meaning that Cu(OH)2 is present. I added a small amound of H2O2 to spped up the formulation
of Cu(OH) and the solution instantly turned dark green to black.
Also i want to ask if it is posible to exist Cu2FeO4? And if it could then electrolysis could work?
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vulture
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I added a small amound of H2O2 to spped up the formulation of Cu(OH)
I'm sorry but that's impossible. From Cu(OH)2 to CuOH is a reduction not an oxidation, thus this is not possible with H2O2.
One shouldn't accept or resort to the mutilation of science to appease the mentally impaired.
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bonemachine
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Anyway my finished product is dark green and i have filtered it out. Looks like rust but the electrodes where Cu and the water had a little h2o2. What
is that green stuff CuO?
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Marvin
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Why not just add sodium hydroxide solution to copper sulphate solution, and heat the precipitated hydroxide until it goes completely black?
What are you after the CuO for?
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bonemachine
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because i don't have those materials and i prefer electrolysis.
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bonemachine
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Also i forgot.... Could someone tell me the exact color of CuO? I mean it is totaly black or dark green? I am realy not sure why the blue color turned
dark green from the adition of h2o2 and if it is CuO.
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madscientist
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CuO is black.
I weep at the sight of flaming acetic anhydride.
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bonemachine
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Then what could be that green stuff?
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raistlin
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No offense, but I dont think I have ever read a thread on this site that seems as kewlish as this... If you dont know what something is, dont ask
stupid questions on here, go look it up on google or dogpile or on whatever! Do sciencemadness a favor and look things up before you talk.
\"To ignite, or not to ignite, that is the question.\"
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bonemachine
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I found nothing searching and i ask again what is this green stuff?
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BASF
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you want to get pure CuO, right?
Make a solution of CuSO4, then add a mix of NaOH and H2O2.
Black CuO will precipitate.
-That´s a method out of wet chemical analysis, if i remember right...
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bonemachine
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Ok i tried this method and it works fine thanks!!
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raistlin
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It could be copper chloride, but I dont know.
\"To ignite, or not to ignite, that is the question.\"
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bonemachine
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The strange is that it was sky blue at the begining and when i aded 3% H2O2 it turned totaly green.
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trinitrotoluene
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I did the same experenment and I had some pretty poor results. What I got was only a thin layer of CuO. I did work but it was a very slow process. I
say 20 times slower then electrolysis of iron to make Fe2O3.
TNT
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rikkitikkitavi
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you could try to electrolyse with Cu-anode in a NaCl solution.
A red preciptate of Cu2O will be formed
anode Cu=> Cu+
Cathode 2 H2O => 2OH- + H2
Cu + 2 Cl- => [CuCl2]- (complex)
but this complex reacts with OH-
2[CuCl2]- + 2 OH- => Cu2O + H2O + 4 Cl-
And I belive that heating Cu2O in air to about 600-700 C will form CuO since this is more stable.
/rickard
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madscientist
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I've noticed that electrolyzing a solution of MgSO4 with a Cu anode, and then allowing it to sit for some time, precipitates
Cu(OH)2.
I weep at the sight of flaming acetic anhydride.
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Theoretic
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Another use of CuO
You could use CuO for thermite mixtures, as well as CuCl2 and CuSO4.
You can get CuO by electrooxidation of copper in a salt solution (the stronger the better) and then heat the green stuff to get CuO.
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vulture
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Read topics before posting, this has been said before!
One shouldn't accept or resort to the mutilation of science to appease the mentally impaired.
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Organikum
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ehem, some humble questions....
from copper sulfate:
- NaOH precipitates Cu(OH)2 ?
- NaOH + H2O2 precipitates CuO ?
but Cu(OH)2 + H2O2 cannot give CuO?
btw. H2O2 is told to be doublefaced - reducing or oxidizing both is possible.
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