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How to clean a separatory funnel?
I soak my glassware in a Na3PO4 bath with soap to clean it when I encounter difficult stains. Works ...
19-5-2019 at 13:41
by: CobaltChloride
Correction of thermometer readings
I always assumed that for distillations you have to place the thermometer so that the bulb is just b ...
19-5-2019 at 13:35
by: CobaltChloride
Yellow ether?
This happened as well with ether distilled from starter fluid in my case. In order to ensure purity, ...
15-5-2019 at 12:05
by: CobaltChloride
Unable to concentrate nitric acid to 68%
https://www.sciencemadness.org/whisper/viewthread.php?tid=13090 This method is my favorite due to it ...
15-5-2019 at 12:00
by: CobaltChloride
Cleaning Marble
You can use sodium thioglycolate. It dissolves iron deposits at neutral pH and it is sold as rust st ...
13-5-2019 at 04:50
by: CobaltChloride
Recovering iodine from copper I iodide
[rquote=612288&tid=149980&author=wg48temp9]
The CuI can also be complexed with hexamine to ...
12-5-2019 at 03:44
by: CobaltChloride
Screwed soap cleaning soln, how to proceed?
Melamine sponges are also great for removing seemingly impossible to remove stains on glassware. I h ...
11-5-2019 at 10:49
by: CobaltChloride
Screwed soap cleaning soln, how to proceed?
As far as I know, soap with perfume works perfectly well for glassware as well as long as it's for c ...
11-5-2019 at 07:23
by: CobaltChloride
Determning purity of OTC sodium hydroxide
It also depends on where you buy it from. Solutions of my supermarket NaHCO3 marketed as baking powd ...
6-5-2019 at 02:15
by: CobaltChloride
12 V vacuum pumps for filtration/distillation
I have bought a similar looking 12V vacuum pump from ebay, although mine was just around 12USD and i ...
4-5-2019 at 15:30
by: CobaltChloride
Determning purity of OTC sodium hydroxide
Here you can get all sorts of NaOH grades. The cheapest one is ~70% NaOH and ~30% NaCl, while the on ...
4-5-2019 at 15:27
by: CobaltChloride
Future-gazing: available now, restricted tomorrow?
Here it is already not available in food stores anymore... Although, this doesn't mean I can't sourc ...
1-5-2019 at 03:05
by: CobaltChloride
Idea for making haloalkanes from OTC ingredients?
The most simple OTC synthesis of a haloalkane is that of MeI posted here I'd say.
https://www.scie ...
26-4-2019 at 15:40
by: CobaltChloride
New proposal for EU regulations
I am not fond of this regulation proposal at all, but for now we still have time to stock up on chem ...
24-2-2019 at 02:43
by: CobaltChloride
New proposal for EU regulations
I hope it will only require such an end-user statement, but we cannot be sure yet...
Also, I haven' ...
21-2-2019 at 09:53
by: CobaltChloride
New proposal for EU regulations
This law proposal has been recently made. It aims to reevaluate the legality of every chemical that ...
21-2-2019 at 09:22
by: CobaltChloride
How to determine the ratio of two chemicals mixed together?
Well you can do it like this, where x is the mass fraction of NaCl, y is the mass fraction of KCl an ...
20-1-2019 at 11:42
by: CobaltChloride
How to determine the ratio of two chemicals mixed together?
That is a bit too high. The density of KCl is 1.984 g/cm^3, while the density of NaCl is 2.17 g/cm^3 ...
20-1-2019 at 11:25
by: CobaltChloride
red P in EU
Well, considering you have 1kg of the stuff and it hasn't ignited at all until now, it would be pret ...
19-1-2019 at 07:33
by: CobaltChloride
Hydrogen peroxide maximum safe concentration
If you do attempt Felab's procedure, please be careful as the highly concentrated H2O2 might explode ...
19-1-2019 at 06:33
by: CobaltChloride
red P in EU
Has anyone tested whether the red P sold by limac contains significant amounts of white P? I want to ...
19-1-2019 at 04:17
by: CobaltChloride
Chemical supplier that ships overseas
The attitude post offices have towards chemicals ordered from other countries varies widely by natio ...
17-1-2019 at 14:42
by: CobaltChloride
Preparation of SnCl2 dihydrate (Stannous Chloride)
I was able to make this salt by a much more simple procedure.

After dissolving the tin in an exc ...
2-1-2019 at 12:17
by: CobaltChloride
K2Cr2O7 from (NH4)2Cr2O7
Easiest way would be to make saturated solutions of KCl and ammonium dichromate and then combine the ...
12-12-2018 at 06:17
by: CobaltChloride
When Chemistry Goes Wrong
Wait, even concentrated NaOH eats PTFE? AFAIK, only molten very reactive metals (like sodium) react ...
3-11-2018 at 09:46
by: CobaltChloride
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