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What are the hard white rubber stoppers made of ?
Those are just butyl rubber, or natural rubber, likely with many additives. The red rubber is basic ... |
18-6-2018 at 12:26
by: Dr.Bob |
FREE chemicals
That is awesome. I would go get the isopropanol, sodium hydroxide and other inorganics, then repack ... |
14-6-2018 at 04:27
by: Dr.Bob |
Lithiation reaction of an Aniline... gooey yield problems, uncrystalizable, not sure where I went wrong
Usually BuLi is added slowly, over many minutes. Often at low temps, so that seems unusual to go q ... |
12-6-2018 at 15:42
by: Dr.Bob |
Are there chinese hotplates & heating mantles as good as others but significantly cheaper?
I can agree that some Chinese glassware is fine. But having used some Chinese electronics, I would ... |
11-6-2018 at 17:37
by: Dr.Bob |
Lithiation reaction of an Aniline... gooey yield problems, uncrystalizable, not sure where I went wrong
Did they not cool the reaction before adding the BuLi? That is pretty standard to avoid spikes in ... |
10-6-2018 at 13:58
by: Dr.Bob |
temp probes for thermoSci and IKA hotplates
Why, are you busy this time of year? ;-)
I have a photo of a few of the thermocouples and some ... |
6-6-2018 at 05:38
by: Dr.Bob |
temp probes for thermoSci and IKA hotplates
I have lots of various thermocouples also, including some long Teflon ones, and many other varieties ... |
5-6-2018 at 09:26
by: Dr.Bob |
Is there a solvent I can use to wash my vacuum pump oil reservoir?
DCM will kill the gaskets, seals, and metal in pumps, so don't let that get into the pump if possibl ... |
30-5-2018 at 17:55
by: Dr.Bob |
Science equipment looking for a home
Here is an updated copy of the inventory. I have a hard time keeping it updated, but I am trying. ... |
29-5-2018 at 18:00
by: Dr.Bob |
Is there a solvent I can use to wash my vacuum pump oil reservoir?
The biggest issue with doing that is any solvent left in the pump can wreck it when you restart it. ... |
29-5-2018 at 12:56
by: Dr.Bob |
Good sources of cerium
Ceric Ammonium Nitrate is used in many labs, that would be my first thing to try to find a sample of ... |
27-5-2018 at 18:19
by: Dr.Bob |
Synthesis of Hexane from Cellulose/Glucose
I worked in biofuels for a short time. This (conversion of cellulose to anything useful) type of w ... |
22-5-2018 at 17:59
by: Dr.Bob |
3-acetylindole
Might be better to protect the indole NH with a alkylprotecting group, like benzyl. But even with a ... |
15-5-2018 at 03:37
by: Dr.Bob |
Is this kit any good?
For the price, it is hard to go wrong, as I sell used 24/40 kits for more than that. The Chinese go ... |
14-5-2018 at 11:22
by: Dr.Bob |
Oxalyl Chloride Challenge
Did you simply chlorinate the solvent TCE to add Cl across the double bond? Not sure how easy that ... |
14-5-2018 at 11:14
by: Dr.Bob |
What's the most expensive substance you've bought?
Had to use a gold catalyst (AuCl3) once, back in grad school, when gold was a bit cheaper, but still ... |
8-5-2018 at 12:58
by: Dr.Bob |
How should I choose glass joint size?
small, cond is 34/45
med, cond is 45/50
large, cond is 55/50
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7-5-2018 at 16:24
by: Dr.Bob |
How should I choose glass joint size?
[rquote=516964&tid=81955&author=fusso]So I think I also need a soxhlet extractor for extract ... |
7-5-2018 at 10:37
by: Dr.Bob |
Buchner funnel: glass or ceramic?
[rquote=517029&tid=82545&author=Sulaiman]I use 90mm filter papers and a porcelain Buchner fu ... |
7-5-2018 at 10:26
by: Dr.Bob |
Do this kind of pumps exist?
There are simple syringe pumps that can push and pull, with the right valves, you can move small vol ... |
3-5-2018 at 17:47
by: Dr.Bob |
possible free ethanol sample
[rquote=516551&tid=82350&author=Hegi][rquote=516381&tid=82350&author=VSEPR_VOID]They ... |
3-5-2018 at 11:47
by: Dr.Bob |
The Sciencemadness TLC Apparatus Challenge
I am remembering when we used to make our own TLC spotters in the undergraduate research lab by heat ... |
2-5-2018 at 09:10
by: Dr.Bob |
ozonolysis alkene->aldehyde, used in industry?
I used to run ozonolysis reactions in industry all of the time. They liked them because the reagen ... |
30-4-2018 at 17:17
by: Dr.Bob |
possible free ethanol sample
They sell a mixture of ethanol and n-heptane (as the denaturing agent). They likely distill off tog ... |
30-4-2018 at 12:59
by: Dr.Bob |
Well time to start making SO3 and Bromine! (Ampoules)
Having tried to seal ampules before, I can say that sealing small ones is hard, 5-10 ml is harder, a ... |
29-4-2018 at 17:56
by: Dr.Bob |
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