| Pages:
1
..
11
12
13
14
15
..
19 |
DJF90
International Hazard
Posts: 2266
Registered: 15-12-2007
Location: At the bench
Member Is Offline
Mood: No Mood
|
|
That would insult about 80% of the members of this board. Think before you speak. And you fall far short of a chemist.
|
|
|
entropy51
Gone, but not forgotten
Posts: 1612
Registered: 30-5-2009
Member Is Offline
Mood: Fissile
|
|
Quote: Originally posted by Picric-A  |
Im a chemist- i prefer to buy Reagent grade 98% sulphuric acid or 69% Nitric acid if i want it, not crappy 'drain opener' like you probably do!
|
If you can buy nitric (or sulfuric) then why on earth are you trying to decompose fertilizer (is that reagent grade too)?
And of course with your official police sanctioned research lab license you are allowed to possess "any chemical you desire".
If you're a chemist, why are you buying obsolete Rotovaps that don't even have half the parts?
If you're a chemist, why didn't you know the answer to this?
If you're a chemist I wonder why most of your posts read like they were written by a 14 year old kewl?
[Edited on 8-9-2009 by entropy51]
[Edited on 8-9-2009 by entropy51]
[Edited on 8-9-2009 by entropy51]
[Edited on 8-9-2009 by entropy51]
|
|
|
panziandi
Hazard to Others
Posts: 490
Registered: 3-10-2006
Location: UK
Member Is Offline
Mood: Bored
|
|
Wait a minute there!
| Quote: Originally posted by Picric-A | If you have easy acess to conc sulphuric this reaction works extremly well.
Simply add pices of copper to a flask followed by conc sulphuric acid and simlpy heat to produce a steady stream of SO2, quite dry. This method works
well when you have plenty of drain opener. Of cours it is pointless when using it to make sulphuric acid via contact process...  |
This was posted by you Picric-A on 30-8-2008 at 10:33 AM, http://www.sciencemadness.org/talk/viewthread.php?tid=11101#... now then you imply using cheap drain unblocker over lab grade due to cost, that is
EXACTLY what Entropy is suggesting by using a cheaper "OTC" grade of sulphuric acid to generate your own cheap nitric acid.
|
|
|
DJF90
International Hazard
Posts: 2266
Registered: 15-12-2007
Location: At the bench
Member Is Offline
Mood: No Mood
|
|
There is nothing wrong with drain cleaner quality sulfuric acid. If one has the determination and patience, and suitable apparatus it can be cleaned
to an equal specification as 98% reagent grade, and even higher if necessary. For many things, it will suffice where concentrated sulfuric acid is
needed.
|
|
|
entropy51
Gone, but not forgotten
Posts: 1612
Registered: 30-5-2009
Member Is Offline
Mood: Fissile
|
|
A real chemist would know that some things don't require reagent grade chemicals, wouldn't he?
I save my ACS reagent grade chemicals for the purposes that require them.
And if one knows what he's buying, not all drain cleaners are crappy. Some are 96% and "technical" grade.
[Edited on 8-9-2009 by entropy51]
|
|
|
DJF90
International Hazard
Posts: 2266
Registered: 15-12-2007
Location: At the bench
Member Is Offline
Mood: No Mood
|
|
A real chemist would know alot of things...
|
|
|
kclo4
National Hazard
Posts: 916
Registered: 11-12-2004
Location:
Member Is Offline
Mood: No Mood
|
|
The continuing conflict between several members and Picric A and his derivatives is degrading the quality of this forum. I think all who participate
should at try to hold back on the comments a bit, though it is damn hard I'm sure.
Picric A, want to help drop your conflicts between members, by not replying to what you might believe are personal attacks? I can see how your post
above was provoked, but why do you choose to keep it going? Please stop for the sake of the forum.
As for the others, it would also be a good thing to stop this BS. Seriously, how many threads have derailed and ended with discussing the quality of
Picric A?
|
|
|
panziandi
Hazard to Others
Posts: 490
Registered: 3-10-2006
Location: UK
Member Is Offline
Mood: Bored
|
|
My Picric acid is ACS reagent grade...
|
|
|
entropy51
Gone, but not forgotten
Posts: 1612
Registered: 30-5-2009
Member Is Offline
Mood: Fissile
|
|
OK, here you used a "roaring bunsen flame"
But here you say you heated it with nichrome wire:
| Quote: Originally posted by Picric-A |
how does it work?? well you could not be lazy and read the thread, but i guess i could tell you. I heated a copper tube full of Ca(NO3))2 beads with
Nichrome wire then passed the evolved gasses through a series of bubblers.
|
Not only are you a liar Picric/Saber/Labxyz, but you are not even a good liar. It's beyond me why you haven't been banned for crapping up our forum
with your fairy tales.
| Quote: Originally posted by Picric-A | If you had read what i wrote carefully you would note that.
Note- The hint is when i said on 2g scale and 'full of nitrate beads'
|
If you did write carefully (and you certainly don't) we wouldn't need hints to decipher what you claim to
have done.
[Edited on 8-9-2009 by entropy51]
|
|
|
Picric-A
National Hazard
Posts: 796
Registered: 1-5-2008
Location: England
Member Is Offline
Mood: Fuming
|
|
Roaring bunsen on test tube scale and nichrome on copper tube scale. If you had read what i wrote carefully you would note that.
Note- The hint is when i said on 2g scale and 'full of nitrate beads'
[Edited on 8-9-2009 by Picric-A]
|
|
|
starman
Hazard to Others
Posts: 318
Registered: 5-7-2008
Location: Western Australia
Member Is Offline
Mood: No Mood
|
|
| Quote: Originally posted by kclo4 | The continuing conflict between several members and Picric A and his derivatives is degrading the quality of this forum. I think all who participate
should at try to hold back on the comments a bit, though it is damn hard I'm sure.
Picric A, want to help drop your conflicts between members, by not replying to what you might believe are personal attacks? I can see how your post
above was provoked, but why do you choose to keep it going? Please stop for the sake of the forum.
As for the others, it would also be a good thing to stop this BS. Seriously, how many threads have derailed and ended with discussing the quality of
Picric A?
|
Ive got to agree.Thre kid is trying to impress with his obvious flights of fancy and fails to understand that it seriously impedes his ability to
benefit from the knowledge of seasoned members and real chemists.
However sustained derisory commentary from those that completely overwhelm the young Walter Mitty both academically and rhetorically is painful to
witness.
[Edited on 9-9-2009 by starman]
[Edited on 9-9-2009 by starman]
[Edited on 9-9-2009 by starman]
Chemistry- The journey from the end of physics to the beginning of life.(starman)
|
|
|
1281371269
Hazard to Others
Posts: 312
Registered: 15-5-2009
Member Is Offline
|
|
Eloquently put.
|
|
|
uchiacon
Hazard to Self
Posts: 87
Registered: 3-7-2009
Location: The Jungle(neezeelund)
Member Is Offline
Mood: Financial
|
|
Somebody ban that f*ckin...
I think he's on bombshock rubbing his cock all over the threads.
"Lol, y wud u waste all dis munney makin nitric when you can by it soo easy?"
That aside, I'm 14, and I don't act like that faggot.
Why did we even bother with this stupid decomp of nitrates for HNO3? Its dirty, annoying, with low yields and general faggotry. I would think that the
bigger questions aren't being answered on this thread, but it seems people has plenty of time to argue wit that noob.
Would you guys think that a magnetic stirrer would be worth making to prevent bumpin on reduced pressure nitric distillations? Will bumping even occur
at like 20-30 torr?
I know that a stirrer will increase how fast the nitric will evaporate, but is that worth integrating it into your home made heating mantle?
Oh, and I'd assume that if I manage to hook up two aspirators in series then I could increase the vacuum? I saw this on the other threads, but does
anyone know by how much? i.e. two aspirators in series both capable for 29.5torr
Cheers
|
|
|
bilcksneatff
Hazard to Self
Posts: 54
Registered: 11-11-2007
Location: Maryland, USA
Member Is Offline
Mood: Sulfuric
|
|
| Quote: Originally posted by panziandi | | OR saturated calcium nitrate solution and add sulphuric acid (fairly strong if not concentrated) that would ppt CaSO4 and leave with a fairly storng
nitric acid solution which could be filtered and distilled. |
I think CaSO4 is pretty soluble in concentrated nitric acid, so this would only work form making dilute acid.
|
|
|
entropy51
Gone, but not forgotten
Posts: 1612
Registered: 30-5-2009
Member Is Offline
Mood: Fissile
|
|
| Quote: Originally posted by uchiacon |
Oh, and I'd assume that if I manage to hook up two aspirators in series then I could increase the vacuum? I saw this on the other threads, but does
anyone know by how much? i.e. two aspirators in series both capable for 29.5torr |
That would not be a correct assumption. The ultimate vacuum is set by the vapor pressure of the water. You should reach that with a good aspirator,
and hooking two in series will not give a better vacuum than one by itself.
I would never vacuum distill without stirring on account of the likely bumping. Sometimes they bump even WITH stirring.
You sure your aspirator is only pulling 29.5 torr? Right now my aspirator is pulling 15 torr (read off a Hg manometer) at a water temperature of 24 C
(which is not very cold at all.) Did you buy the aspirator new? Plastic (and to a lesser extent) metal aspirators do wear out and don't pull as low.
Glass aspirators last forever (unless you break them.)
[Edited on 10-9-2009 by entropy51]
[Edited on 10-9-2009 by entropy51]
Better to remain silent and appear a fool than to open your mouth and remove all doubt.
|
|
|
uchiacon
Hazard to Self
Posts: 87
Registered: 3-7-2009
Location: The Jungle(neezeelund)
Member Is Offline
Mood: Financial
|
|
Well I just looked at the aspirator and it said 29.5 torr max... couldn't find many glass aspirators either. But wouldn't a metal aspirator be just as
good as a glass one? They're both pretty darn hard.
This is one of the only glass aspirators I found, and it looks like it has that old style aspirator make. are these ones as affective as the normal
ones?
www.onlinesciencemall.com/Shop/Control/Product/fp/vpid/17874...
And one from sigma aldrich, somehow at a crazy 150USD.
www.sigmaaldrich.com/catalog/ProductDetail.do?D7=0&N5=SE...
If you has any other sources for a normal looking glass aspirator do tell.
Cheers
|
|
|
entropy51
Gone, but not forgotten
Posts: 1612
Registered: 30-5-2009
Member Is Offline
Mood: Fissile
|
|
I think the metal aspirators may not hold up in the long run if you distill a lot of HNO3 with them. HCl fumes probably won't do them any good
either. Occasional use with acids may be OK, though.
I believe my glass aspirators were made by Kimble, but they look very much like the one in the Aldrich link above. Yes, they look old fashioned, but
my glass aspirators wotk better than the metal and plastic aspirators that I've used. The vacuum is as good or better and it seems to me that the
glass aspirators use less water, although I haven't measured the water consumption.
But if the one you have works for you then what more can you ask?
Better to remain silent and appear a fool than to open your mouth and remove all doubt.
|
|
|
Magpie
lab constructor
Posts: 5939
Registered: 1-11-2003
Location: USA
Member Is Offline
Mood: Chemistry: the subtle science.
|
|
Introduction of a tiny amount of air below the surface of the pot liquid will prevent bumping. I do this with a piece of glass tubing drawn to a
pipette end. On the other end of the tube is a piece of rubber tubing with a screwed pinch clamp for adjusting the air flow rate. The tube is held
in place with a thermometer adapter in a Claisen adapter. This is the method recommended in my organic chemistry lab manual. It works well.
If requested I can post a picture of this "ebulliator."
[Edited on 11-9-2009 by Magpie]
The single most important condition for a successful synthesis is good mixing - Nicodem
|
|
|
entropy51
Gone, but not forgotten
Posts: 1612
Registered: 30-5-2009
Member Is Offline
Mood: Fissile
|
|
Magpie, I'll bet you and I are the only ones hereabouts who've used an ebulliator.
Gatterman would be proud of you!
I'm old school but I gave them up when I got a magnetic stirrer. They do work - unless solid forms in the pot and then I didn't find them as helpful.
Better to remain silent and appear a fool than to open your mouth and remove all doubt.
|
|
|
dann2
International Hazard
Posts: 1523
Registered: 31-1-2007
Member Is Offline
Mood: No Mood
|
|
Will a few boiling chips not help here? Some pieces of red flowerpots sounds good.
Dann2
|
|
|
entropy51
Gone, but not forgotten
Posts: 1612
Registered: 30-5-2009
Member Is Offline
Mood: Fissile
|
|
Boiling chips seem to lose their effectiveness under vacuum, although some people do use them. And bumping tends to be worse under vacuum. Boiling
chips work fine for distillation at atmospheric pressure.
Better to remain silent and appear a fool than to open your mouth and remove all doubt.
|
|
|
uchiacon
Hazard to Self
Posts: 87
Registered: 3-7-2009
Location: The Jungle(neezeelund)
Member Is Offline
Mood: Financial
|
|
The metal aspirators are made out of brass with a laquer coating.
So not just plain metal.
Also tried out my 68% nitric today on some copper plating stripped off gouging rods, made tons of NO2. Lucky I did it outside, and then I reduced the
copper nitrate to copper bits with zinc battery casings. Wish we could do that at school..
Can you give me a link for your kimble glass aspirator? Or any other links for a glass aspirator? And do the different designs make a difference?
Cheers
|
|
|
not_important
International Hazard
Posts: 3873
Registered: 21-7-2006
Member Is Offline
Mood: No Mood
|
|
| Quote: | | Can you give me a link for your kimble glass aspirator? Or any other links for a glass aspirator? |
http://208.72.236.210/html/pg-924000.html
http://www.onlinesciencemall.com/Shop/Control/Product/fp/vpi...
|
|
|
chloric1
International Hazard
Posts: 1147
Registered: 8-10-2003
Location: GroupVII of the periodic table
Member Is Offline
Mood: Stoichiometrically Balanced
|
|
| Quote: Originally posted by uchiacon |
Lucky I did it outside, and then I reduced the copper nitrate to copper bits with zinc battery casings. Wish we could do that at school.
Cheers |
Man you MUST be joking I took highschool chemistry in 1990 and copper in nitric acid was an essential lab to demonstrate metal chemistry. We put
copper in nitric acid in a fume hood, went home and then returned the next day and add water if needed and added sodium hydroxide to make copper
hydroxide gell(loved that) and then heated the gell to form black Copper
oxide. After decantation 6M HCl was added to form clear green solution and an aluminum wire was dropped in. Went home and came back next day to find
clear solution and salmon colored copper deposits with a little debris from the aluminum.
I suppose you are now going to tell me they no longer do the sugar in sulfuric acid trick or the lead iodide gold trick.
Fellow molecular manipulator
|
|
|
bilcksneatff
Hazard to Self
Posts: 54
Registered: 11-11-2007
Location: Maryland, USA
Member Is Offline
Mood: Sulfuric
|
|
| Quote: Originally posted by chloric1 | Man you MUST be joking I took highschool chemistry in 1990 and copper in nitric acid was an essential lab to demonstrate metal chemistry. We put
copper in nitric acid in a fume hood, went home and then returned the next day and add water if needed and added sodium hydroxide to make copper
hydroxide gell(loved that) and then heated the gell to form black Copper
oxide. After decantation 6M HCl was added to form clear green solution and an aluminum wire was dropped in. Went home and came back next day to find
clear solution and salmon colored copper deposits with a little debris from the aluminum.
I suppose you are now going to tell me they no longer do the sugar in sulfuric acid trick or the lead iodide gold trick. |
I took HS chem last year. We did none of those things! I wish we would have! I didn't like the teacher though; most of the class was bookwork and
we hardly ever did labs. The most "dangerous" thing we ever did was titration of HCl with NaOH (and we did that within the first two weeks of AP Bio
this year!). No nitric or sulfuric at all; even the teacher didn't demonstrate anything with them. We did maybe one metathesis, and it wasn't nearly
as cool as the lead(II) iodide precipitation. Didn't even cover redox in the class. The worst part was that my school didn't have AP Chem, so I
couldn't take a decent chem class!
Even so, thats what a home lab is for!
[Edited on 12-9-2009 by bilcksneatff]
[Edited on 12-9-2009 by bilcksneatff]
[Edited on 12-9-2009 by bilcksneatff]
|
|
|
| Pages:
1
..
11
12
13
14
15
..
19 |
![[*]](images/xpblue/default_icon.gif){kind=icon}
