RogueRose
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Copper powder from CuSO4 + ascorbic acid - what ratio is needed of Asc Acid & what's left over - H2SO4?
I tried a small test run of this reaction by using filtered vitamin C pills and I got some really nice Cu powder. Nothing formed until I got the
solution boiling and the first run through I stopped with a little liquid left but a fair amount of CuSO4 crystals formed upon drying, so I added
water and heated again until it was almost dry and it seemed that most/all of the water had boiled off, but there was still a greenish/brown solution
left barely covering the bottom. I also noticed that the vapor started to smell a little different towards the end and I suspected that I might be
left with H2SO4 as IDK how this reaction is formed and where the SO4 goes during the reaction.
I'm trying to figure out what is left over after boiling and how to seperate the powder and solution and what to do with it. It is still acidic,
which I figured it had to be.
Also, does anyone have any suggestions on the ratio's of ascorbic acid to CuSO4 to use? I've seen this reaction done with CuCl2 but the amounts of
ascorbic acid were incredibly high and I know I used MUCH less (maybe 10% of what was suggested) for my reaction and it seemed to work well. I did
get some pure powder which I'm going to try and was wondering if I could add it as powder or if I should dissolve it into a solution first.
Now I just need to figure out a way to filter this stuff b/c it goes through most of my filter papers until it is completely clogged up and so much
gets trapped in it.
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old school
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Try using a centrifuge to separate it.
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Tsjerk
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Dehydroascorbic acid is formed, it donates two electrons.
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Bedlasky
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Use CuSO4 + Fe and boil it for a while. This is much cheaper way how to make copper powder. Another alternative is CuSO4 + HCl + Al.
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valeg96
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I did it this spring with about 1L of saturated copper nitrate solution and around 200+ g of ascorbic acid. The copper you get with this method is a
disgusting superfine orangeish/maroon powder, and can't be properly washed or filtered with home tools. I decanted it with liters and liters of water,
until I gave up, filtered it all on multiple funnels and shoved it in the oven. Since I didn't especially need metallic copper but just wanted to
recover copper in any form I let it combust in the oven (it burns like steel wool and got superfine black CuO.
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TriiodideFrog
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What a coincidence! I just tried the experiment before I came online. The ascorbic acid remained at 1.2 M while the copper sulfate concentration was
varied to achieve 12:1, 6:1, and 3:1. i am still waiting for the results. Here is another thread on the topic, if it can help you
:http://www.sciencemadness.org/talk/viewthread.php?tid=31113 
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njl
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How did you measure concentrations?
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RogueRose
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I can testify that the copper particles are incredibly small. My biggest problem was figuring out how to add the solutions. Should I add the CuSO4
to an ascorbic acid solution, or the opposite? Also, it seems that heat is needed for this to work and I found that bubbling was a major issue but I
did use Vit C tablets dissolved & filtered, so maybe there was something in there.
I seem to recall the CuSO4 solution was supposed to turn green when the ascorbic acid (AA) was added, I found that it did but it quickly reverted
back, and I don't think I was short on the AA.
In doing this research I also came across some method to make nano CuO and maybe nano Cu2O and I seem to recall it was done by passing CO or H2 over
the copper salt (I think CuSO4). If anyone remembers the method on how to make nano CuO or Cu2O, I'm be interested in that as well
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TriiodideFrog
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My CuSO4 Solution did turn green, but there also seems to be something else in the Vitamin C pills as after a day the solution became unclear.
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SaccharinSlayer157
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Here's a good video by chemplayer on the topic
https://www.bitchute.com/video/cMo36tADFb3v/
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TriiodideFrog
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I tried another method by just letting the copper precipitate. It is really slow and the copper is more reddish than normal. The solution also turned
a really dark murky green.
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