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Author: Subject: The Short Questions Thread (4)
DubaiAmateurRocketry
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[*] posted on 23-12-2013 at 04:09


Is there other way to get 70% nitric acid up to >90% without distillation ? I have strong dessicants such as Ac2O, P2O5, magnesium perchlorate/ sulfate.

I am not sure how to get the acetic acid or phosphoric acid out of my 95% HNO3 after the water is gone though.
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bismuthate
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[*] posted on 23-12-2013 at 04:20


On the wiki page for N2O5 it shows that nitric acid is dehydrated by P2O5 (even to the point of becoming N2O5) but if you used it how would you get rid of the H3PO4?



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kristofvagyok
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[*] posted on 23-12-2013 at 05:17


Quote: Originally posted by bismuthate  
On the wiki page for N2O5 it shows that nitric acid is dehydrated by P2O5 (even to the point of becoming N2O5) but if you used it how would you get rid of the H3PO4?


N2O5 could be easily distilled/sublimed out from the reaction mixture, since it has a really low boiling point.




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DJF90
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[*] posted on 23-12-2013 at 09:15


Theres a preparation in Brauer that does exactly that.
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plante1999
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[*] posted on 23-12-2013 at 13:36


Very short question, does anyone know if you can order from McMaster-carr as an individual?

If so, how do we proceed?

Thanks




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DubaiAmateurRocketry
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[*] posted on 23-12-2013 at 15:42


Quote: Originally posted by kristofvagyok  
Quote: Originally posted by bismuthate  
On the wiki page for N2O5 it shows that nitric acid is dehydrated by P2O5 (even to the point of becoming N2O5) but if you used it how would you get rid of the H3PO4?


N2O5 could be easily distilled/sublimed out from the reaction mixture, since it has a really low boiling point.


Hehe its dissolved, and you cant distill it, it will simply decompose into N2, O2 and NOx.

I would really want an answer on how to get phosphoric acid out of HNO3, after I dried the water, or obtained some N2O5 in dissolved HNO3 ;)
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bismuthate
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[*] posted on 23-12-2013 at 18:22


We'll you could only add enough P2O5 to dehydrate it to 90% and distill.
You could try vacuum sublimation or dissolving it in Chloroform.

[Edited on 24-12-2013 by bismuthate]

[Edited on 24-12-2013 by bismuthate]




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[*] posted on 26-12-2013 at 09:36


I'm buying some test tubes from elementalscientific.net, and it only sells rubber stoppers separately, the tubes are 20 mm across, but their stoppers use a different scale (or whatever you call it), does anybody know what size stopper fits a 20 mm test tube?



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[*] posted on 26-12-2013 at 09:45


Just checked for you, you would want to get a number 2... 1 fits but is a bit too small

image.jpg - 74kB
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Zyklon-A
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[*] posted on 26-12-2013 at 09:58


Thank you.



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[*] posted on 26-12-2013 at 11:07


Quote: Originally posted by Zyklonb  
I'm buying some test tubes from elementalscientific.net, and it only sells rubber stoppers separately, the tubes are 20 mm across, but their stoppers use a different scale (or whatever you call it), does anybody know what size stopper fits a 20 mm test tube?


http://www.tekniscience.com/documents/Corning_Guide_for_Sele...




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DubaiAmateurRocketry
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[*] posted on 26-12-2013 at 14:15


Is it possible to concentrate H2O2 solution using dessicants ? Such as Magnesium sulfate/ lithium perchlorate ?
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[*] posted on 26-12-2013 at 17:14


Does the use of NaCNBH3 add methyl to the reductant? I should know and can't find the ref on reductions with metal hydrides. Thanks.



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[*] posted on 26-12-2013 at 19:48


Quote: Originally posted by DubaiAmateurRocketry  
Is it possible to concentrate H2O2 solution using dessicants ? Such as Magnesium sulfate/ lithium perchlorate ?

Why not just evaporate it off with heat?




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[*] posted on 26-12-2013 at 21:09


Quote: Originally posted by Zyklonb  
Quote: Originally posted by DubaiAmateurRocketry  
Is it possible to concentrate H2O2 solution using dessicants ? Such as Magnesium sulfate/ lithium perchlorate ?

Why not just evaporate it off with heat?

Or you could react barium peroxide with nitric acid (if you have them). Just make sure there are no transition metal impurities or else it will decompose on production.
Basic hydrogen peroxide can be made by adding sodium peroxide to water (and sodium peroxide can be made by burning sodium in air). It will be strongly basic however.




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[*] posted on 26-12-2013 at 21:38


Sodium is very costly, as are Barium peroxide and nitric acid, also it's not very pure, not worth it at all.



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[*] posted on 27-12-2013 at 08:33


Since I can't seem to find any sort of help on this: How do you set up a water aspirator? More specifically, I'm confused about the top - it looks as though it should thread onto a hose or sink or some such.



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[*] posted on 27-12-2013 at 08:51


Ugh I had a hell of a time when I bought mine... I bought the brass attachment bit from the same company that I got the aspirator from. I think this is the part you are referring to, it seems to be hard hose size. They sold it as a faucet adapter but it clearly is not for household tape anyways. I went to a aquarium specialty store and bought the white piece, it's a tap adapter for a "Python" aquarium vacuum thing, it converts the kitchen tap thread size into the required size. It cost me something like $4. I would have liked a metal one but oh well... It works perfect anyways.

**edit: here is the item http: http://www.amazon.com/gp/product/B000255NUU?ie=UTF8&forc... it actually consists of two pieces, the top bit is a male end which you may or may not need depending on your faucet

image.jpg - 68kB image.jpg - 58kB

[Edited on 27-12-2013 by Mailinmypocket]

[Edited on 27-12-2013 by Mailinmypocket]
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DubaiAmateurRocketry
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[*] posted on 27-12-2013 at 14:30


can any of those cation and anion go together to form a salt, or any of the below already exist ?

Amino-tetrazolium, dioxygenyl, nitronium, ammonium, hydrazine, guanidine.

peroxide /superoxide /ozonide/hydride/aluminum hydride/borohydride.
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[*] posted on 27-12-2013 at 14:43


Quote: Originally posted by DubaiAmateurRocketry  
can any of those cation and anion go together to form a salt, or any of the below already exist ?

Amino-tetrazolium, dioxygenyl, nitronium, ammonium, hydrazine, guanidine.

peroxide /superoxide /ozonide/hydride/aluminum hydride/borohydride.


I doubt it. Ions like aminotetrazolium, ammonium and hydrazinium are acidic; anions like peroxide, superoxide, and hydride are strong bases, and would immediately react. Cations like dioxygenyl, nitronium and nitrosyl are strongly electrophilic (Lewis acids) and would similarly react immediately with the anions you've listed.




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DubaiAmateurRocketry
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[*] posted on 27-12-2013 at 17:31


thank you draconic acid, i know acid/ base salts rarely or dont come together however hydroxyl ammonium perchlorate, for example, exist. Yes the ones i pointed out is more extreme but just sayin.

http://www.tandfonline.com/doi/abs/10.1080/07370650008216114...

Also I wonder if this paper is true, It says Ammonium superoxide/ ozonide is a solid ? really ?

Quote: Originally posted by bismuthate  
On the wiki page for N2O5 it shows that nitric acid is dehydrated by P2O5 (even to the point of becoming N2O5) but if you used it how would you get rid of the H3PO4?


I wonder.. Maybe distill ? I personally hate distillating though, any other way ?

______

And another question.

How reactive is Aluminum hydride ?

I was reading a paper on a crazy rocket fuel that uses aluminum hydride as a fuel mixed in some nitrate ester plasticizers and seems they have no problem with it. However nitronium perchlorate is obviously coated.

US Patent - Plasticized nitrocellulose propellant containing Aluminum hydride and Nitronium perchlorate.
https://docs.google.com/viewer?url=patentimages.storage.goog...

[Edited on 28-12-2013 by DubaiAmateurRocketry]

[Edited on 28-12-2013 by DubaiAmateurRocketry]
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[*] posted on 29-12-2013 at 16:32


Quote: Originally posted by Mailinmypocket  
Ugh I had a hell of a time when I bought mine... I bought the brass attachment bit from the same company that I got the aspirator from. I think this is the part you are referring to, it seems to be hard hose size. They sold it as a faucet adapter but it clearly is not for household tape anyways. I went to a aquarium specialty store and bought the white piece, it's a tap adapter for a "Python" aquarium vacuum thing, it converts the kitchen tap thread size into the required size. It cost me something like $4. I would have liked a metal one but oh well... It works perfect anyways.

Got a plastic adapter for mine. Judging from a cursory test with the garden hose, it pulls pretty strong vacuum. Getting a vacuum gauge within a week or so (although questionable about the authenticity, it's $5... http://www.amazon.com/gp/product/B004VU8Q5Q/ref=oh_details_o...)




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[*] posted on 29-12-2013 at 18:14


What would happen to U-235 if we would irradiate it with a weak, less than 1MeV H+ beam? Would Np-236 form?
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[*] posted on 29-12-2013 at 23:37
Question


What is the most convenient way to prepare sodium hexametaphosphate ((NaPO3)6) from sodium orthophosphate (Na3PO4)? Wikipedia states conversion to the dihydrogen salt (with concentrated H2SO4?) followed by melting and rapid cooling (how would one rapidly cool? Dunk container in cold water?)



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[*] posted on 31-12-2013 at 02:33



Quote:

101. Preparation of Ethyl Acetate from Alcohol and Acetic Acid.—(SECTION 160).—Mix in a dry 200 cc. distilling flask 50 grams of alcohol, 60 grams of glacial acetic acid, and 4 cc.
concentrated sulphuric acid. from norris experimental o-chem
I'm bit unclear on how much % excess alcohol must be used in esterificationss. This procedure uses 1.085 mol EtOH and 1 mol AcOH. Is that really enough? Also, bit of a noob question how would you calculate the % excess?



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