lvjrf
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Ammonium Dichromate Volcano
Ammonium dichromate (NH4)2Cr2O7
when decompoed Ammonium dichromate (the reaction like volcano)
we obtain Cr2O3 + N2 + H2O
the Cr2O3 Used as catayste
I want to ask
how can we prepare Ammonium dichromate (NH4)2Cr2O7 ??
Edit: Changed title.
[Edited on 16-10-2004 by chemoleo]
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guy
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http://www.rhodium.ws/chemistry/potassium.dichromate.html
This is rhodiums site for making Potassium dichromate. But instead of using potassium chloride, you could use NH4Cl to precipitate the NaCl and ge
ammonium dichromate.
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Tacho
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I strongly advise you to check the MSDS of these chromium salts before you mess around with them. Some are linked to cancer.
The smoke of your volcano is something I would like to stay away from.
[Edited on 15-10-2004 by Tacho]
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vulture
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The "smoke" consists of water, nitrogen and chromiumtrioxide, which are harmless.
Only chromium 6+ compounds are carcinogenic.
One shouldn't accept or resort to the mutilation of science to appease the mentally impaired.
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chemoleo
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??? Chromiumtrioxide, CrO3, is VERY toxic, and VI+! Besides that would be oxidised... so knowing my old friend vulture I presume you meant Cr2O3,
which normally (or so I think) comes under the name chrome oxide?
This oxide is green, and indeed not very toxic. When I did the ammoniumdichromate volcano recnetly, it'd leave a fine Cr2o3 residue - which could
be used straight for a thermite reaction with Al  . I think I may have mentioned
that in the exotic thermites thread.
Anyway - lvrf, I think the making of dichromates has been covered in a thread here (apart from the rhodium procedure), search and you shall find. Then
you could make the ammoniumform from it as guy suggested.
Never Stop to Begin, and Never Begin to Stop...
Tolerance is good. But not with the intolerant! (Wilhelm Busch)
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MadHatter
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Cr2O3
Makes a spectacular thermite mixed with powdered Mg. Use some welding goggles
when watching this one !
From opening of NCIS New Orleans - It goes a BOOM ! BOOM ! BOOM ! MUHAHAHAHAHAHAHA !
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lvjrf
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Thanks for all
Thanks for all
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I am a fish
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When I've done the volcano experiment, small amounts of unreacted (NH4)2Cr2O7 have always remained. Crystals of it get scattered away from the
main pile without being ignited, and consequently don't react.
1f `/0u (4|\\| |234d 7|-|15, `/0u |234||`/ |\\|33d 70 937 0u7 /\\/\\0|23.
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