32 replies to this topic

[asilentbob]

The slight bit shouldn't hurt it much, but yes you can rinse with water, distilled water would be preferable.

[crazyboy25]

Well i just synthed some copper and made 10g of euters blue it is very nice. It burns very fast though, I probably shouldn't have ground up my ammonium perchlorate, I should have just used as is (200 micron)

Here is the vid:


I am surprised how easy it was to make copper though, I was using really impure copper sulfate from fungicide. It was so impure infact it was green not blue. I just dissolved as much copper sulfate as possible in about 200 mls water added 10-15 mls 98% sulfuric acid and slowly added zinc. Then I waited about 1 hour until it finished bubbling and added water and decanted several times then I filtered it and put it in the oven until it was dry. It worked like a charm.


I will do the synth again with pics as soon as I get 99% copper sulfate then maybe I will start a synthesis thread in the chemistry section...

[psyco_1322]

So we synthed up some copper powder for a stoichiometry lab in chem class Friday. We used iron powder and it seemed to work rather well. It was in a warn solution of CuSO4 because we heated it to speed up desolving it.

Why did you add the acid Crazyboy? Catalyst?

Can some one write out the equation that shows how NaCl acts as a catalyst with CuSO4 and Al? Im not sure how catalyst work in the equation world. Does this looks right?

CuSO4 + NaCl --> Na2SO4 + CuCl2
CuCl2 + Al --> Cu + AlCl3
Na2SO4 + AlCl3 --> Al2(SO4)3 + NaCl

Its a random stab at what I think should happen. Looks right to me.

[Mumbles]

Where did you hear it acted as a catalyst?

[crazyboy25]

Where did you hear it acted as a catalyst?

Which reference are you talking bout to H2S04 or NaCl as a catalyst?

[Mumbles]

NaCl specifically.

I do wonder about the acid too though. Yes, it would remove any excess zinc, but you'd just be using up good reagent adding it at the beginning, as noticable by the bubbling. The actual reaction taking place produces no gas. It seems like an awefully lot if you're using it to "activate" the zinc surface to make it react faster. The pH is WELL below 1.

[crazyboy25]

Yes but my copper sulfate was incredibly impure and failed to reacted without a catalyst. My copper sulfate water mix was an opaque green I decanted several times and tested with PH strips by the 5th wash it was neutral.

[psyco_1322]

I was asking about acid.

My chem teacher said the NaCl was a catalyst.

OH and I fixed my chemical misnamings.

[Mumbles]

NaCl is not a catalyst in this situation. Neither is acid. Just because it's not bubbling doesn't mean it's not reacting.

Zn + CuSO4 ---> ZnSO4 + Cu

Acid will only eat away the Zn, and NaCl I have no idea what the reasoning behind it is. The only possible explanation I can see for acid would be to remove the oxide coating on the outside of the Zn, and maybe keep it from getting passivated.

[psyco_1322]

The NaCl was used with Al not Zn. It did speed up the reaction a significant amount.

[swapnilsutar1988]

hey guys anybody have formula for blue star using nitrates and copper carbonate.

[debubisu]

i have no chlorate or perchlorate, so i try to make a new blue with pvc powder cuo. i mix pvc and cuo togather and pasting it on a paper with nc lacquer (wood clear lacquer). dry and test open air have a nice blue,you can test it.

Edited by debubisu, 21 June 2015 - 04:19 AM.

[mbfuturex]

Wouldnt purchased copper powder of a high purity and about -320 mesh be suitable?