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Author: Subject: The Short Questions Thread (4)
hissingnoise
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[*] posted on 1-11-2015 at 06:49


DEA throwing in the towel ─ here's acetic anhydride for sale on ebay . . . ???

Pricy, too!

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battoussai114
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[*] posted on 1-11-2015 at 17:51


I was checking the mechanism for Citric Acid / Ethylene Glycol gel formation (studying sol-gel deposition for an upcoming project) and based on what I saw it seems that any diol would work for the purpose of polymerizing and getting the gel part of sol-gel... since the Citric Acid is responsible for locking the metal cations in place, the diol characteristics seem minor as it's only there to form a polyester.
Am I missing something? Why do people specifically use EG?

[Edited on 2-11-2015 by battoussai114]




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Tabun
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[*] posted on 2-11-2015 at 07:34


Does anybody know a book on drugs synthesis?Not recipes nor "easy to make drugs"...I want to understand exactly what and how it's happening.I can come up with some ideas but only in theory and I don't really know where to look for more info so a book on this subject would be the best.I don't want to cook or anything similar.I mean...there's a book with war gases in this site's library and explosives are a part of this site so you should understand what I'm trying to say...I just like them and I'm interested in them.
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[*] posted on 2-11-2015 at 07:46


Alexander Shulgin's TiHKAL and PiHKAL seem to be The books on drug synths.



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mayko
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[*] posted on 8-11-2015 at 22:01


I've tried to make iron sulfide from the elements, once by stoichiometric proportions and once by teh 7:4 mass ratio prescribed by Nile Red. I can't seem to get it to ignite! Touching with hot glass or using a magnesium ribbon fuse just creates burning blue sulfur, and a direct blowtorch flame kicks up a bunch of golden burning iron sparks. Is there something I am missing?



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JJay
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[*] posted on 8-11-2015 at 22:20


What size particles of iron are you using?
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[*] posted on 10-11-2015 at 08:19


What can I do with 2.7g of bis(tetraethylammonium) tetrachlorocuprate(II)?



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[*] posted on 10-11-2015 at 08:36


You can complain about the fact that you didn't make it in time for the copper carnival.



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[*] posted on 10-11-2015 at 11:50


Is it possible to efficiently recover an amine from a silicotungstic or phosphotungstic acid complex?
Is there a significant variation in properties of these if the complexed amine is primary, secondary, or tertiary?
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mayko
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[*] posted on 10-11-2015 at 13:07


Quote: Originally posted by JJay  
What size particles of iron are you using?


Iron filings, not otherwise specified




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The Volatile Chemist
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[*] posted on 10-11-2015 at 15:30


Quote: Originally posted by Eddygp  
What can I do with 2.7g of bis(tetraethylammonium) tetrachlorocuprate(II)?

Wow...where'd you get that one...?
You could 'still out the tetraethylammonia if you don't own any, though that's a bit wasteful...




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karlos³
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[*] posted on 12-11-2015 at 11:05


Can somebody tell my if its possible to prepare mandelic acid from styrene?
I need some mandelic acid, I´ve ordered some but my supplier is taking too long to deliver it.
Styrene is on hand, lots of it.

I know it is possible to make mandelic acid from styrene via enzymatic synthesis, but I don´t know if it can be chemically made.
Eating some styrene and extracting my urine to get mandelic acid is not an option! :D

Is there an easy and chemical way to prepare this compound from styrene?
Otherwise I will just wait till it gets delivered.

I´ve searched far and wide but did not get any references for its chemical synthesis, its only mentioned in the measurement of exposure to styrene via urine analysis.
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Texium (zts16)
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[*] posted on 12-11-2015 at 14:16


Does anyone know how to use these stemless fritted funnels? I've always used the kind with stems, but I found one of these at school and want to use it for a project I'm working on.

14473664019741346542111.jpg - 1.1MB




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[*] posted on 12-11-2015 at 14:21


It's a Gooch crucible.
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[*] posted on 12-11-2015 at 14:26


Have you ever used a Gooch crucible ?

If so, please explain how one is used (i already read the Google results).

What is not clear in the photo is whether the frit is open at the bottom, or if that is a sealed bottom with a stand, so it might be something different.




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[*] posted on 12-11-2015 at 14:36


It is open at the bottom, it does appear to be a gooch crucible. But I second aga: how do you use it? It can be used as a normal fritted funnel still, can't it?



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[*] posted on 12-11-2015 at 14:48


You need a Buchner flask and a ring of rubber.
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[*] posted on 12-11-2015 at 17:54


You have to first filter a suspension of some type of medium, by vacuum, to put down a filter "mat" over the perforations in the bottom. Then you filter your product. Back in the day (I won't say when), we used a suspension of asbestos fiber to make the mat.
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[*] posted on 12-11-2015 at 18:02


What is the general opinion of using a tank of propane (like the kind used in a BBQ grill) to fuel a Bunsen burner? hBarSci doesn't recommend it, but then proceeds to give a detailed list of the parts needed, various brass fittings, mainly. All brass to brass joints are sealed with a Teflon tape similar to plumber's joint tape, but I think it is a more particular kind of tape, for this application.
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[*] posted on 12-11-2015 at 18:27


I use a barbecue propane tank with my Bunsen burner and it works great, but it requires a special type of regulator. Fortunately for me, I was able to get one from someone who used to use a similar setup but didn't need it anymore. I'm not sure exactly what type of regulator it is, but I should be able to post a picture of it later.



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[*] posted on 12-11-2015 at 18:36


zts16: thanks for the quick response. I would very much like to see a photo, when it is convenient for you to post one. Perhaps your valve has some kind of model number/company name on it That would be good to know too.
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[*] posted on 15-11-2015 at 13:55


Does anyone use the typical lab-type/school-type Bunsen burners at all in their home labs? They seem impractical for the amateur...



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[*] posted on 15-11-2015 at 14:10


Quote: Originally posted by CharlieA  
You have to first filter a suspension of some type of medium, by vacuum, to put down a filter "mat" over the perforations in the bottom. Then you filter your product. Back in the day (I won't say when), we used a suspension of asbestos fiber to make the mat.


No, you don't. We use just a straight frit to collect precipitates all the time.




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[*] posted on 15-11-2015 at 18:45


I believe that, strictly speaking, a Gooch crucible has a perforated bottom, not a frit. If some kind of mat is not laid down over the perforations ("holes"), about the only thing you can filter will be BB's or marbles.
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[*] posted on 15-11-2015 at 18:57


Depends on the crucible. Glass Gooch crucibles typically have fritted bottoms, while porcelain Gooch crucibles need some kind of additional filter aid such as an asbestos mat.
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