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Filtering speed - same filter but poor results with vacuum pump
No, definitely not with NaOH. 2NaOH +SiO2 = Na2SiO3, which is soluble.
HCl, OTOH, is the usual w ... |
22-5-2017 at 06:36
by: PirateDocBrown |
Filtering speed - same filter but poor results with vacuum pump
Garden grade DE can be quite impure. Give it several wash/dry cycles before using it in earnest.
... |
21-5-2017 at 17:45
by: PirateDocBrown |
Sodium Metabisulphite & Magnesium
Na2S2O5 (aq) + 6 Mg (s) + 9 H2O (l) = 2 H2S (g) + 2 NaOH (aq) + 6 Mg(OH)2 (s)
The precipitation o ... |
20-5-2017 at 15:06
by: PirateDocBrown |
Filtering speed - same filter but poor results with vacuum pump
[rquote=483668&tid=74160&author=Magpie]I suggest you put down a 1/8" bed of diatomaceous ear ... |
20-5-2017 at 14:45
by: PirateDocBrown |
Filtering speed - same filter but poor results with vacuum pump
Whenever possible I always put paper on top of a frit. Help keep the frit clean. Obviously, it doesn ... |
20-5-2017 at 02:22
by: PirateDocBrown |
Birch reduction - why does it reduce OH from pseudoephedrine, rather than reducing the benzene ring?
I would love to see photos! |
19-5-2017 at 03:03
by: PirateDocBrown |
Birch reduction - why does it reduce OH from pseudoephedrine, rather than reducing the benzene ring?
Very good!
Here's some more food for thought:
I mentioned the activity of the amine only to se ... |
18-5-2017 at 21:23
by: PirateDocBrown |
Name brand Glassware (250ml - 5L), hotplate/stirrer, rotovap, vials, crimper, funnels, adapters, available
[rquote=483464&tid=74107&author=RogueRose][rquote=483463&tid=74107&author=PirateDocB ... |
18-5-2017 at 01:18
by: PirateDocBrown |
Name brand Glassware (250ml - 5L), hotplate/stirrer, rotovap, vials, crimper, funnels, adapters, available
If you are moving ground jointware, it would be useful to indicate the sizes of the joints. |
17-5-2017 at 23:10
by: PirateDocBrown |
Birch reduction - why does it reduce OH from pseudoephedrine, rather than reducing the benzene ring?
Indeed that's true for reduceable groups at the benzylic position.
But for a reagent with groups ... |
17-5-2017 at 23:06
by: PirateDocBrown |
Birch reduction - why does it reduce OH from pseudoephedrine, rather than reducing the benzene ring?
A little literature search finds an original article describing the secondary reaction.
There's n ... |
17-5-2017 at 16:54
by: PirateDocBrown |
Birch reduction - why does it reduce OH from pseudoephedrine, rather than reducing the benzene ring?
Sigh. I am making nothing up. This is exactly the Birch reduction. (see attached graphic). There's e ... |
17-5-2017 at 11:50
by: PirateDocBrown |
Birch reduction - why does it reduce OH from pseudoephedrine, rather than reducing the benzene ring?
A Birch reduction is indeed Na/NH3, (not LAH) but is done to an aromatic ring. Few substituent group ... |
17-5-2017 at 09:13
by: PirateDocBrown |
Birch reduction - why does it reduce OH from pseudoephedrine, rather than reducing the benzene ring?
Hint: How much more electronegative do you think oxygen is than carbon?
Do the pi electrons cont ... |
17-5-2017 at 01:01
by: PirateDocBrown |
Birch reduction - why does it reduce OH from pseudoephedrine, rather than reducing the benzene ring?
If it involves reduction of a hydroxyl group and not that of an aromatic ring, it's not a Birch redu ... |
17-5-2017 at 00:06
by: PirateDocBrown |
Great source for pure nutrient/supplement-type chemicals (purebulk.com)
Good find! |
15-5-2017 at 16:29
by: PirateDocBrown |
Women in Chemistry
There's a good number of female chemical engineers at the university where I went to undergrad. Most ... |
15-5-2017 at 16:25
by: PirateDocBrown |
Camphor
Indian grocery stores sell camphor. Indian cuisine actually uses small amounts of it as a flavoring. ... |
15-5-2017 at 01:18
by: PirateDocBrown |
Firearm Primer Question
Primers have evolved over time.
Initally, mercury fulminate was the principal compound used.
B ... |
13-5-2017 at 20:36
by: PirateDocBrown |
Camphor
I recall some university lab somewhere that had a tall (like several stories) column for the resolut ... |
13-5-2017 at 01:09
by: PirateDocBrown |
General Question about heating mantles
You can put some foil, then some sand in there, for smaller flasks. Spreads the heat around a little ... |
12-5-2017 at 20:31
by: PirateDocBrown |
Camphor
Found an inexpensive source of camphor, about $25/kilo.
Natural camphor is a single enantiomer ke ... |
12-5-2017 at 17:48
by: PirateDocBrown |
looking for cheapest routes to acid sythesis
HCl and H2SO4 are usually OTC. I got a gallon of HCl for under $20, and half gallon of H2SO4 for the ... |
11-5-2017 at 11:50
by: PirateDocBrown |
"Different Uses of Steel with Different Technical Conditions" - spam
Usually, spam is nonsense. but this title actually looks legit!
Are they getting cleverer? |
8-5-2017 at 15:36
by: PirateDocBrown |
Downstairs shelf
The downstairs shelf has the CRC Manual, Elschenbroich's Organometallics, Carey's undergrad Organic, ... |
8-5-2017 at 12:14
by: PirateDocBrown |
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