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PHILOU Zrealone
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Never underestimate the slow processes or low concentration processes...
-Acidity of NH4NO3 solution is enough in solution to chew Al foil in a few days while Al stands HNO3.
-HNO3 69% can effectively nitrate toluen in monthes at 20°C ... you get nitrobenzoic acids mixed with o-/p- nitrotoluen.
Sometimes the only way is to try and find out!
PH Z (PHILOU Zrealone)
"Physic is all what never works; Chemistry is all what stinks and explodes!"-"Life that deadly disease, sexually transmitted."(W.Allen)
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AJKOER
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OK, I recall the report of an experiment where Al foil was used to cover a flask containing NO2. Crystals of Aluminum nitrate were formed. This is not
an isolated instance as per Wikipedia (http://en.wikipedia.org/wiki/Nitrogen_dioxide ) to quote:
"NO2 is used to generate anhydrous metal nitrates from the oxides:[6]
MO + 3 NO2 → 2 M(NO3)2 + NO"
So, first generate NO2 and react with CuO (or Cu, see below) to create anhydrous Copper nitrate.
Now, as to why an aqueous path is not wise, per Wikipedia on Copper Nitrate to quote (see http://en.wikipedia.org/wiki/Copper_nitrate ):
"Anhydrous Cu(NO3)2 forms when copper metal is treated with N2O4:
Cu + 2 N2O4 → Cu(NO3)2 + 2 NO
Attempted dehydration of any of the hydrated copper(II) nitrates by heating instead affords the oxides, not Cu(NO3)2. At 80 °C, the hydrates convert
to "basic copper nitrate" (Cu2(NO3)(OH)3), which converts to CuO at 180 °C.[2]"
So, one could also use either Cu or CuO to prepare anhydrous Cu(NO3)2 with N2O4.
I doubt if I one could call the Copper metal based preparation, however, a metathesis reaction. The reason being that such a reaction is technically
define as occurring when cations and anions exchange partners (see discussion at http://chemistry.osu.edu/~woodward/ch121/ch4_metathesis.htm ).
[Edited on 25-12-2013 by AJKOER]
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blogfast25
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Amen to that.
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TheChemiKid
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The metal oxide method works, I just tried it yesterday.
When the police come
\( * O * )/ ̿̿ ̿̿ ̿'̿'̵͇̿̿з=༼ ▀̿̿Ĺ̯̿̿▀̿ ̿ ༽
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blogfast25
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Aren't you going to share what you did with us? From 'it works' very little can be learned.
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Romain
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@PHILOU Zrealone for you hints about flash powders, I'll try to avoid sugar for color tests and use Al or Mg instead!
I'll also try to make some pure KNO3 (without Na) but that will be costly since KCl is 5CHF (~6$) for 100g.. I may order some chemicals on ebay
sometime. I'll try PVC too as it's readily available.
@blogfast25 I saw a video on youtube of some CuSO4/Mg flash powder. Impressive!
I'll porbably try that soon, I have some CuSO4 crystallizing at the moment, it should be ready in a few weeks.
The NO2 route to make nitrate salts is interesting though you need some way of generating NO2.
Perhaps via the Birkeland-Eyde process?
You could put some metal oxide at the bottom of a 3 neck round bottom flask with a stir bar. 2 of the necks would be used for the high-voltages
electrodes and the third would be stoppered for quick access and to add some oxygen and nitrogen when needed. The stir-bar would be used to allow the
gas to come in contact with the finely powdered oxide.
If that works that may be useful to make exotic anhydrous nitrates
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blogfast25
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Wow. Big bangs. But no significant flame colouration though... Adding some anhydrous CuCl2 (easy to prepare) could increase colouration.
[Edited on 31-12-2013 by blogfast25]
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