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Registered Member #3766
Joined: Sun Mar 20 2011, 05:39AM
Location:
Posts: 624
I think the brown gunk should have been a combo of acetate ions, chloride ions (probably came out in the bubbles), and the rest of the gas was probably hydrogen being released by the separation of the acetic acid ions and also oxygen gas from the hydrogen peroxide. The brownish gunk was probably copper(I) oxide. Sounds like you had a decent concentration of copper in that solution there. There was probably a stronger concentration of sodium ions at the positive electrode (and in the remaining solution, bet it burns a nice yellow) and there was probably a small amount of hydrogen bubbling at the positive electrode also.
It was probably also green at the end because of the copper chloride, but you should still be abe to drive off a high concentration of acetic acid.
Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
Well, now, the solution has turned a nasty brown color with whitish cloudy junk on the bottom of the jar after further electrolysis fun. When it bubbles now, the bubbles are a faint yellow color, and they don't pop very quickly at all. Upon further analysis, it appears that there is some slight yellow junk buildup on one of the clip leads.
I'm sort of wondering if maybe I should let it evaporate (outside of course) and see what happens.
Registered Member #3766
Joined: Sun Mar 20 2011, 05:39AM
Location:
Posts: 624
I have no idea. Yellow could be any of a number of things, but it sounds like most of the gases were worked out. (I'ma get a 5 on the AP chemistry test )
Electrolysis-electroplating... ugh I had a bad experience with that once. I made a very salty water solution, and used an AC adapter, connected penny to one, and paper clips to the other. All I got was a partially corroded penny, dissolved paper clips, and a very warm, disgusting green cup of salt water and a copper compound. Ew. it was horribly disgusting.
Registered Member #3888
Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
I've been having great success with HCl based etchants (well, the creation and testing of them. haven't etched any real circuits yet) I tried the electrolysis methods to produce the copper chloride but just ended up with several jars containing multiple layers of sludge. get some muriatic acid and storebought H2O2 and go from there. the acid i've been using is only ~6M but it's been making rather powerful CuCl2 and FeCl3 solutions. It's fun screwing around with chemistry and dissolving metals isn't it? I've got a bunch of various indium/lead/Al/iron/copper/tin/zinc compounds of the oxide/hydroxide/chloride/nitride/nitrate variety and don't know what to do with most of them.
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Electrolysis
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