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I have some old pieces of wire. Since I want to use copper in homemade fireworks, I'm trying to gather it from the wires. I could buy it, however harvesting is much more fun.

Sulphuric acid doesn't dissolve copper in normal conditions, even when it's concentrated. However adding $\ce{H2O2}$ causes vigorous reaction during which copper sulphide is created.

copper sulphide solution

On the solution surface, remains of impurities are floating. I'm afraid, however, that most of impurities were dissolved. Were they?

I don't need my $\ce{CuSO4}$ chemically clean, but too much impurities could increase the risk of toxic gases during electrolysis.

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  • $\begingroup$ The difficulty here is that you've almost surely got excess peroxide and sulfuric acid in your solution, and it's going to be a challenge to eliminate them in a safe way in your kitchen/garage without resorting to something more expensive than just buying the chemical you want to make or producing a toxic byproduct. If I were going to do this, I would just buy a couple of pounds of copper sulfate. It's sold at home improvement/hardware stores as root killer in high purity form for very little money. $\endgroup$ – Jason Patterson Oct 1 '14 at 4:21
  • $\begingroup$ This way I could just buy copper dust as well, since that's what I need. No, I'm really trying to purify it. $\endgroup$ – Tomáš Zato Oct 1 '14 at 5:01

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