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Aqua_Fortis_100%
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Registered: 24-12-2006
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i tried the experiment yesterday.
putted about 10g of cutted copper wires in another disposable plastic cup and then about 5oml of household bleach solution, and to this i added
slowly about 5g of NaOH pellets (slowly because of heat of dissolution of NaOH in water of bleach which can lead to NaClO decomposition into
chlorate).the stuff fall to bottom (together with Cu wires) and did for some time a white "cloud" in the bottom of the cup,and small bubbles
evolved.. i let then, reacting overnight and now, i see the progress:
almost NOTHING..
all the wires stay covered with a black coating layer of CuO and above the wires the pale green/brownish solution (maybe a suspension) and the inner
sides of the cup covered with same black stuff,but much more thin than the wires..because of this layer, the reaction seemed to stop.so i tried remove
the layer carefully brushing it with a small wooden stick, but was quite difficult to remove this stuff without removing out the wires of the
solution..
well,i think which the real reaction woelen provided really work, but because of the materials used (e.g. the wires),the reaction really is too slow
for pratical extration of the CuO..
in fact the results are only the black layer formed on the wires..
i thought if this worked i will do the same but using Ca(ClO)2 instead.. but now because of the experiment , i think which this can be a tremendous
waste of precious Ca(ClO)2 ...
are there another good home prep for CuO , without using copper sulfate ?(e.g. using the best , cheap and widely avaliable copper wires and other Cu
stuffs)
"The secret of freedom lies in educating people, whereas the secret of tyranny is in keeping them ignorant."
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not_important
International Hazard
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Heat the copper in air, shaking or hitting it to knock the oxide off. Roast the collected oxide in air, stirring it, as it will be a mixture of Cu(I)
and Cu(II) oxides when it falls off the bulk copper.
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Aqua_Fortis_100%
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thanks , not_important ...
this is a basic procedure my mind do not cogitated try before!!! 
only some questions i wish to kill: are there a catalyst(any salt or liquid compound) for this oxidation? and the best temperature?
again, thanks.
"The secret of freedom lies in educating people, whereas the secret of tyranny is in keeping them ignorant."
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12AX7
Post Harlot
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Yeah...it's called acid.
Or ammonia (which is a bad idea to mix with bleach, but does dissolve copper).
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not_important
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Dark red heat. This method gives a fairly coarse product, likely to still contain some Cu2O. It also takes a cheap source of heat, and is slow.
Air and aqueous acids, which I think is basically what you started this thread with, will dissolve copper. Bubbling air through the solution speeds it
up, ammonium salts can help speed thing up but you more NH4 than copper; adding ammonia itself will also work but you have to keep adding it as some
goes off with the air, some combines, and some gets oxidised. Use a soluble carbonate or bicarbonate to get the copper out of solution, much easier to
work with than hydroxide, roast the basic copper carbonates in air to convert to the oxide. Don't put much effort into washing the carbonate
precipitate, wash the oxide afterwards.
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12AX7
Post Harlot
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Ammonium salts need to be basic. If you can smell ammonia, then there are molecules of ammonia in solution which will complex with copper. Ammonium
ions won't.
If you're using HCl, dilute the solution to light blue, or use H2SO4 or HNO3. A green solution gives the oxychloride regardless of the base used to
precipitate (hydroxide or carbonate).
Tim
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