| Pages:
1
..
5
6
7
8
9
..
104 |
DubaiAmateurRocketry
National Hazard
Posts: 841
Registered: 10-5-2013
Location: LA, CA, USA
Member Is Offline
Mood: In research
|
|
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.
|
|
|
bismuthate
National Hazard
Posts: 803
Registered: 28-9-2013
Location: the island of stability
Member Is Offline
Mood: self reacting
|
|
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?
|
|
|
kristofvagyok
National Hazard
Posts: 659
Registered: 6-4-2012
Location: Europe
Member Is Offline
Mood: No Mood
|
|
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.
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." |
|
|
DJF90
International Hazard
Posts: 2266
Registered: 15-12-2007
Location: At the bench
Member Is Offline
Mood: No Mood
|
|
Theres a preparation in Brauer that does exactly that.
|
|
|
plante1999
International Hazard
Posts: 1936
Registered: 27-12-2010
Member Is Offline
Mood: Mad as a hatter
|
|
Very short question, does anyone know if you can order from McMaster-carr as an individual?
If so, how do we proceed?
Thanks
I never asked for this.
|
|
|
DubaiAmateurRocketry
National Hazard
Posts: 841
Registered: 10-5-2013
Location: LA, CA, USA
Member Is Offline
Mood: In research
|
|
| 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 
|
|
|
bismuthate
National Hazard
Posts: 803
Registered: 28-9-2013
Location: the island of stability
Member Is Offline
Mood: self reacting
|
|
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]
|
|
|
Zyklon-A
International Hazard
Posts: 1547
Registered: 26-11-2013
Member Is Offline
Mood: Fluorine radical
|
|
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?
|
|
|
Mailinmypocket
International Hazard
Posts: 1351
Registered: 12-5-2011
Member Is Offline
Mood: No Mood
|
|
Just checked for you, you would want to get a number 2... 1 fits but is a bit too small
|
|
|
Zyklon-A
International Hazard
Posts: 1547
Registered: 26-11-2013
Member Is Offline
Mood: Fluorine radical
|
|
Thank you.
|
|
|
S.C. Wack
bibliomaster
Posts: 2419
Registered: 7-5-2004
Location: Cornworld, Central USA
Member Is Offline
Mood: Enhanced
|
|
| 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...
|
|
|
DubaiAmateurRocketry
National Hazard
Posts: 841
Registered: 10-5-2013
Location: LA, CA, USA
Member Is Offline
Mood: In research
|
|
Is it possible to concentrate H2O2 solution using dessicants ? Such as Magnesium sulfate/ lithium perchlorate ?
|
|
|
chemrox
International Hazard
Posts: 2961
Registered: 18-1-2007
Location: UTM
Member Is Offline
Mood: LaGrangian
|
|
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.
"When you let the dumbasses vote you end up with populism followed by autocracy and getting back is a bitch." Plato (sort of)
|
|
|
Zyklon-A
International Hazard
Posts: 1547
Registered: 26-11-2013
Member Is Offline
Mood: Fluorine radical
|
|
Why not just evaporate it off with heat?
|
|
|
Brain&Force
Hazard to Lanthanides
Posts: 1302
Registered: 13-11-2013
Location: UW-Madison
Member Is Offline
Mood: Incommensurately modulated
|
|
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.
At the end of the day, simulating atoms doesn't beat working with the real things...
|
|
|
Zyklon-A
International Hazard
Posts: 1547
Registered: 26-11-2013
Member Is Offline
Mood: Fluorine radical
|
|
Sodium is very costly, as are Barium peroxide and nitric acid, also it's not very pure, not worth it at all.
|
|
|
elementcollector1
International Hazard
Posts: 2684
Registered: 28-12-2011
Location: The Known Universe
Member Is Offline
Mood: Molten
|
|
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.
Elements Collected:52/87
Latest Acquired: Cl
Next in Line: Nd
|
|
|
Mailinmypocket
International Hazard
Posts: 1351
Registered: 12-5-2011
Member Is Offline
Mood: No Mood
|
|
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
 
[Edited on 27-12-2013 by Mailinmypocket]
[Edited on 27-12-2013 by Mailinmypocket]
|
|
|
DubaiAmateurRocketry
National Hazard
Posts: 841
Registered: 10-5-2013
Location: LA, CA, USA
Member Is Offline
Mood: In research
|
|
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.
|
|
|
DraconicAcid
International Hazard
Posts: 4332
Registered: 1-2-2013
Location: The tiniest college campus ever....
Member Is Offline
Mood: Semi-victorious.
|
|
| 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.
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
|
|
|
DubaiAmateurRocketry
National Hazard
Posts: 841
Registered: 10-5-2013
Location: LA, CA, USA
Member Is Offline
Mood: In research
|
|
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]
|
|
|
elementcollector1
International Hazard
Posts: 2684
Registered: 28-12-2011
Location: The Known Universe
Member Is Offline
Mood: Molten
|
|
| 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...)
Elements Collected:52/87
Latest Acquired: Cl
Next in Line: Nd
|
|
|
LiD
Harmless
Posts: 13
Registered: 12-5-2013
Member Is Offline
Mood: No Mood
|
|
What would happen to U-235 if we would irradiate it with a weak, less than 1MeV H+ beam? Would Np-236 form?
|
|
|
elementcollector1
International Hazard
Posts: 2684
Registered: 28-12-2011
Location: The Known Universe
Member Is Offline
Mood: Molten
|
|
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?)
Elements Collected:52/87
Latest Acquired: Cl
Next in Line: Nd
|
|
|
HeYBrO
Hazard to Others
Posts: 289
Registered: 6-12-2013
Location: 'straya
Member Is Offline
Mood: 
|
|
| 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?
|
|
|
| Pages:
1
..
5
6
7
8
9
..
104 |
![[*]](images/xpblue/default_icon.gif){kind=icon}
