make CuO (copper oxide) simply and cheaply

CuO is good for make CuO/Al 4,4:1 thermite.
the just reaction is:
2 NaOH + CuSO4 --- Cu(OH)2 + Na2SO4
then the Cu(OH)2 is decomposed in
CuO+H2O.
you excuse to me for the error !
for synthesize it, you mix NaOH, CuSO4 1:2 (updated in 25/05/2011) in weight
good work !!!

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Science & Technology

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• supertermite
• termite

[Mr71seventyone1]

can i use cu[no3]2 powder please help me out

[ottanicubano88]

@Mr71seventyone1

I don't know, search on internet

[giorulesallofu]

@ottanicubano88 I completed the process using 100% pure of each chem. I still have some light blue condition, even tho i have mixed w/ boiling water, stirred and decanted > 10x. The light blue could either be Cu(OH)2 or copper sulfate. Im not sure which. Even worse, my final product is a medium gray, not black as i had hoped. In solution it was black, it changed when it dried. Any idea what happened? The help would be much appreciated!

[ottanicubano88]

@giorulesallofu

I don't remember if the proportion between NaOH and CuSO4 are exact, many people contact me, I must remake the stoichiometric count...when I have time;

probably in your reaction lack other NaOH and the CuSO4 don't have react totally..

[jlasud]

I made the whole synthesis and after a day I still have small particles of cuso4 in my bottle like 5-max10% in the CuO. I mixed them 1:4 by weight,I heated the solution,stirred it,change water 4 times and still.I'm sure it will stay there no matter what.Is this normal or I messed up something?

[ottanicubano88]

@jlasud

you must dissolve CuSO4 in water before of add NaOH, and NaOH is 1 and CuSO4 is 4 in weight.

[spotlightman1234]

Lol the actual equation is: CuSO4 + 2NaOH --> Cu(OH)2 + Na2SO4

[rgmcall]

a much easier way is to just get a copper salt like copper carbonate and heat it in a pan it will decompose into copper oxide copper carbonate is easy to make simply get a solution of copper sulfate( drain care Root killer) and add sodium bicarbonate(baking soda) to it it will form copper carbonate and a sodium sulfate solution just filter out the copper carbonate and thats it

[robinhooodvsyou]

-Even cheaper method is to electrolyse a sodium bicarbonate solution with copper metal(wire, pipe, rod, sheet etc),then collecting the sludge and heating it to form black copper oxide.

[ManganistanDraselny]

@Mr71seventyone1 You can heat Cu(NO3)2 and it will decompose. 2 Cu(NO3)2 → 2 CuO + 4 NO2 + O2

[demnlordd666]

@spotlightman1234 the only reason it turned out like your equation is because of your molar rations 1:1 would be a different story.

[demnlordd666]

@spotlightman1234 are you sure the reaction isn't CuSO4 +H2O(solvent) +NaOH --> CuO + HNaSO4? both sodium and hydrogen are more reactive than copper and and have the same valence of +1 and the SO4 is -2 . but the resulting sodium bisulfate is a strong acid in water. copper is below hydrogen in activity but hydrogen ions likes oxygen and there would be CuO + CuOH + NaHSO4 + H+ +NaOH to many equilibriums to calculate, stick to heating the cloride or sulfate of copper to get its oxides

[spotlightman1234]

@CheckOutThisComment Yes i do, but you the decomposition of the hydroxide is a separate reaction Also it is possible to obtain dry pure Cu(OH)2.

[MrAde9999]

@giorulesallofu it is blue beacus it still contains water,

copper sulfate becomes copper oxide when it is heated to 600 degrees celcius when this happens SO2 and O2 is released.

soo u migh need to heat it more

[DanFrederiksen]

black power? : )

if you do it like that you should probably attach a sign to the bottle so people don't think it's cola and drink it.