APO
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Dehydration of Calcium Peroxide Octahydrate
I had an idea for dehydrating it by leaching out the water with Isopropanol and then adding Sodium Chloride to make the Calcium Superoxide layer
imiscible with the layer of salt water formed and then sucking up the Calcium Superoxide layer with a syringe and then boiling off the Isopropanol
leaving the anhydrous Calcium Superoxide. I had another idea to dehydrate it by adding Acetone to make it less polar and then boiling that off. If I
can dehydrate it by heating alone, someone give me a specific temperature. I have no idea if I can use a simple desiccating chamber.
"Damn it George! I told you not to drop me!"
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Prometheus23
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You cannot mix calcium peroxide with water. If you'd like to know why you can google it. It's literally the THIRD sentence on the results page when
you search for calcium peroxide...
Also, calcium peroxide and calcium superoxide are not the same thing. But hey, that's probably somewhere on that page of google results too.
[Edited on 5/4/2013 by Prometheus23]
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APO
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My bad, I meant Peroxide not Superoxide. I'm just having trouble finding a simple way to dehydrate Calcium Peroxide Octahydrate to obtain the
anhydrous form. I was thinking maybe that ANHYDROUS Isopropanol would dissolve Calcium Peroxide (since I heard that Strontium Peroxide dissolves in
alcohol) and that in solution it would split up into Calcium Peroxide and water, and that by adding Sodium Chloride, it would separate into two layers
(since Isopropanol is imiscible with salt water), so that I would have one of salt water and one of anhydrous Isopropanol/anhydrous Calcium Peroxide.
Also I had another idea were I would add it to Acetone/Isopropanol so that once the Isopropanol had dissolved it, the polarity of the Acetone would
have a higher affinity for the water than the Calcium Peroxide would so that I could then boil off the solution for the pure product. I heard it can
be dehydrated by heating, but no specific temperature was stated. Anyway you guys know of that 100% works please give details. Even if a desiccating
chamber will work with a certain desiccant.
"Damn it George! I told you not to drop me!"
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Adas
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Even though you would manage to dehydrate it successfully, the main impurity would be CaO. I believe that this could be removed by very carefully
adjusting pH to make the CaO dissolve in the slightly acidic environment, leaving the CaO2 behind. Just an idea, though this could also lead to
decomposition. The reaction of CaO2 with water is not very fast, but is visible. Probably ice-cold water would do.
Rest In Pieces!
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unionised
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Ignoring the fact that it won't do what you want to do for the minute; do you really want to mix a fuel with this strong oxidiser?
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kristofvagyok
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It is usually dried in a vacuum desiccator under oxygen atmosphere for a few days, or at 80-100 Celsius. Avoid even traces of CO2 at elevated
temperatures, since it will cause decomposition the peroxide.
The ideas with azeotropic distillation is simply insane. Do not even try to mix those two and start to boil that mixture. You will suffer really soon
from really bad looking injuries.
And for the insane idea with the acetone... Do you heard about acetone peroxide? Imagine that there is only a little acid left in your acetone or at
the surface of the Ca-peroxide hydrate. You start to boil it and when it reaches the point when it's almost dry you will hear a loud bang. These
stuffs at even trace quantities could be dangerous. Don't be stupid.
I have a blog where I post my pictures from my work: http://labphoto.tumblr.com/
-Pictures from chemistry, check it out(:
"You can’t become a chemist and expect to live forever." |
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APO
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Damn, totally forgot about TATP. But thanks for the procedure kristofvagyok .
"Damn it George! I told you not to drop me!"
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unionised
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Don't worry too much about forgetting stuff. We all do it.
For example, kristofvagyok is about to kick himself when I point out that calcium peroxide is nearly as strong a base as calcium hydroxide so if I "
Imagine that there is only a little acid left in your acetone or at the surface of the Ca-peroxide hydrate. " then I imagine that it will be
neutralised with the production of a small amount of hydrogen peroxide.
My guess is that, at least up until the point where oxidation sets in and the mixture explodes, the actual reaction with acetone would be something
like this
http://www.orgsyn.org/orgsyn/orgsyn/prepContent.asp?prep=cv1...
The real issue is that, unless you are planning to make explosives and rocket fuels, you should be very careful about mixing oxidants and fuels.
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woelen
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APO, I have a serious suggestion for you: try to teach yourself some basic chemistry! I see multiple posts from you, most of them about energetic
compounds, on how to obtain them. This is not the way to go. You look like a k3wl in this way and people more and more respond to you as if you were a
kewl, who just wants a quick bang and wants to impress his friends with some energetic stuff. This is not cool at all, actually it looks childish.
Basic concepts you need to teach yourself:
- Atoms, elements, molecules
- Symbolic representation of chemical compounds
- Reaction equations and how to balance them
- Acids and bases
- Redox reactions
- Analytical methods (qualitative, but also quantitative)
Try to do experiments which demonstrate the things you teach yourself.
If you teach yourself some chemistry, then you understand things and then you even might be able to design your own methods of synthesis and
separation. Also, try to make easier to prepare and less risky compounds first. While doing so, you obtain a lot of theoretical and practical
experience and it is very rewarding to show the result of your work.
Some suggestions:
- Make CuCl2.2H2O from copper metal, dilute hydrochloric acid and hydrogen peroxide, or use electrolysis to dissolve a copper anode. All chemicals are
easy to get, you can use plain stranded electrical copper wire as a source of copper. At the same time, this synthesis already gives quite a few
challenges and from a theoretical point of view it demonstrates a few very important basic concepts.
- Try to purify chemicals from hardware stores, e.g. make higher concentration ammonia from 5% household ammonia, distill 10% muriatic acid to make
pure 20% hydrochloric acid.
Remember this: You first need to be able to walk before you can think of running.
[Edited on 6-5-13 by woelen]
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APO
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I'm not as dumb as I seem.
Quote: Originally posted by woelen  |
Basic concepts you need to teach yourself:
- Atoms, elements, molecules
- Symbolic representation of chemical compounds
- Reaction equations and how to balance them
- Acids and bases
- Redox reactions
- Analytical methods (qualitative, but also quantitative)
Try to do experiments which demonstrate the things you teach yourself.
[Edited on 6-5-13 by woelen] |
I'm familiar with all these.
"Damn it George! I told you not to drop me!"
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Bot0nist
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Obviously...
U.T.F.S.E. and learn the joys of autodidacticism!
Don't judge each day only by the harvest you reap, but also by the seeds you sow.
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Finnnicus
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Do it apo. Learn again.
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APO
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Finnnicus, what?
"Damn it George! I told you not to drop me!"
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Finnnicus
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Basic concepts. Start from the start, even if its boring.
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