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Venturi Water Aspirator - Bad design? Not achieving a good vacuum
For most aspirators to provide a good vacuum, you need a water pressure from 60-100 psi at a flow ra ...
14-1-2020 at 14:24
by: Dr.Bob
Emulsions from MgSO4?
Just take some and mix with a simple solvent like hexane, stir, decant the emulsion off, then dry th ...
12-1-2020 at 20:04
by: Dr.Bob
Emulsions from MgSO4?
It may just have fines in the mix, MgSO4 is the fluffiest drying agent, so it could do that. If yo ...
12-1-2020 at 14:38
by: Dr.Bob
Removing charcoal from evaporating dish
A little KOH in EtOH will generally clean most things off of glass or just etch off enough glass to ...
7-1-2020 at 13:53
by: Dr.Bob
Science equipment looking for a home
[rquote=629032&tid=15667&author=Doc B]Any chance you have any of the following?

A short ...
5-1-2020 at 13:47
by: Dr.Bob
Recycling bromide from Grignard reactions
I doubt that you can collect the salts in any useful manner, KBr is dirt cheap compared to most of ...
27-12-2019 at 14:31
by: Dr.Bob
Not so secret Santa thing
I hope you all can find uses for many of the odd bits and pieces I threw in with the bottles, vials, ...
18-12-2019 at 10:43
by: Dr.Bob
Not so secret Santa thing
Wow, that was fast. Glad to hear it made it there so quick. Hopefully everything is intact in it.
16-12-2019 at 18:55
by: Dr.Bob
Patience and Rubazonic acid
Because they are pretty, I would guess. Great colors there. I have made some pyrazoles before a ...
16-12-2019 at 07:39
by: Dr.Bob
Is this synthesis of Diethyl Acetal safe?
If you have a glass pressure tube (Ace ones are good to about 200-300 psi), then I might try this be ...
16-12-2019 at 07:36
by: Dr.Bob
Not so secret Santa thing
Folks,

I have just shipped out a bunch of boxes with a few left to finish. Everybody should get ...
14-12-2019 at 09:23
by: Dr.Bob
Corning PC-351 Repair
I still have a few old broken Corning hotplates like this if anyone wants to try to repair them or s ...
13-12-2019 at 17:29
by: Dr.Bob
Magpie has died
I just heard about Magpie and while I did not know him personally as well as many others on here, I ...
13-12-2019 at 08:41
by: Dr.Bob
ethylene tetrafluoroethylene (ETFE) synthesis
Your question is not clear, as the polymer ETFE is likely made by the copolymerization of a mixture ...
13-12-2019 at 07:27
by: Dr.Bob
Amounts of sulfuric acid and excess reactant in fischer esterificatoin procedures
Most of the time for a Fischer the alcohol (if it is a simple alkyl one, like methanol or ethanol) i ...
12-12-2019 at 15:33
by: Dr.Bob
Allyl Bromide Preparation
That is a great writeup and experimental detail. I'd give it an A+ if I was teaching a class.
...
12-12-2019 at 15:24
by: Dr.Bob
Nitration of phthalic acid
What else is there to do with 3-NO2-PHA? What country are you in? I made some of that about 40 ...
5-12-2019 at 05:16
by: Dr.Bob
Not so secret Santa thing
I'll have to see what the prices are now, I used to ship there often, but then the rates doubled a f ...
4-12-2019 at 13:03
by: Dr.Bob
Not so secret Santa thing
Folks,

I want to thank everyone here as well as try to just be nice to people.

I have a few ...
3-12-2019 at 17:31
by: Dr.Bob
14/20 Reflux (Dimroth) Condensers?
All of those are fine, there are dozens of variations of reflux condensers, I like the 14/20 one sho ...
1-12-2019 at 15:20
by: Dr.Bob
Suggestions of getting a lab heating source
Yes, using an oil bath to transfer the heat. This helps to even out the temperature, and allows a v ...
26-11-2019 at 06:14
by: Dr.Bob
How strict are you about using distilled water vs nondistilled/faucet water in your reactions?
I work in a real lab, and even there we use deionized water where it seems most useful, like reactio ...
21-11-2019 at 18:06
by: Dr.Bob
Science equipment looking for a home
It is getting extremely expensive to ship anything out of the US now, due to stupid postal treaties ...
16-11-2019 at 19:40
by: Dr.Bob
Suggestions for glass joint-grease that won't get stuck after vacuum distillations?
Teflon tape is fine for most cases, but will not hold a high vacuum as it is both slightly gas perme ...
13-11-2019 at 20:00
by: Dr.Bob
Suggestions for glass joint-grease that won't get stuck after vacuum distillations?
They make some very thin Teflon sleeves that work well for vacuum work, but not cheap. I agree tha ...
12-11-2019 at 17:54
by: Dr.Bob
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