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j_sum1
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I acquired a jar of hydroquinone. Maybe 500g. What can be done with it?
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PeterC
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You could do some hydroquinone dye chemistry or make and develop your own silver halide paper.
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JJay
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It's an easy target for Friedel-Crafts alkylations. It's also used extensively in amateur photography, but I'm not exactly sure what for.
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Texium
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Kind of a minor use for it, but if you ever make styrene it can be used in trace amounts as a preservative to prevent repolymerization.
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JJay
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I actually didn't know that, but I've been collecting polystyrene for that very purpose.
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PirateDocBrown
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Hydroquinone is an excellent free-radical scavenger!
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PeterC
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Today I got:
8 KI 16.601g Fiksanals (or Fixanals if you're American)
5g Methyl Orange
5g Eriochrome T Black
5g Fluorescein
25g Cobalt (II) Sulfate Heptahydrate
1g Congo Red
[Edited on 20-12-2016 by PeterC]
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PeterC
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Today's Acquisitions:
ChemPur:
Sodium Sulfate Anhydrous 500g
Sodium Metabisulfite 1kg
Potassium Carbonate Anhyd. 500g
Sodium Tetraborate tech. 1kg
Ethylene Glycol 1L
Stanlab:
Sulfuric Acid 96% 1L
Nitric Acid 65% 1L
WarChem:
Boric Acid 500g
Tri-Calcium Phosphate 2x250g
Sodium Sulfite 2x250g
Potassium Chlorate 250g
Ammonium Chloride 100g
Ammonium Fluoride 50g
Chromium Trioxide 100g
Strontium Nitrate 100g
Diethyl Ether 250ml
Benzene 100ml
Pyridine 100ml
[Edited on 27-12-2016 by PeterC]
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Schleimsäure
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Methylamine HCl 250g
Diethyl Malonate 250 ml
Propiophenone 250 ml
Bromobenzene 250 ml
GAA 2,5l
Catechol 250g
1,2 Dichlorobenzene 400ml
n-Butylamine 100ml
Cycloheyxylamine 100ml
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JJay
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Wow! Apparently, you can buy whatever you want in Germany.
I just picked up some sodium hypochlorite and acetic acid, both dilute solutions, as well as distilled water.
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Schleimsäure
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Quote: Originally posted by JJay  | Wow! Apparently, you can buy whatever you want in Germany.
I just picked up some sodium hypochlorite and acetic acid, both dilute solutions, as well as distilled water. |
Nah, that would be a wrong impression. Many reagents restricted/watched in the US you can have without paperwork indeed, like Red P, iodine,
methylamine etc.
But everything toxic you can't receive by mail. Cyanide, Arsenic salts, Benzene is nearly impossible to get as a private person without connections or
"special sources".
Also there is only two onlineshops left who sell to private individuals.
These are way overpriced, and NaBH for example you would have to collect at the warehouse after filling out some paperwork, it is T, so no postage to
individuals. Problem, when the physical location is 400 km's away.
Poland is much better ... and cheaper. And not too far away from Berlin where I live 
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JJay
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Benzene isn't that hard to obtain in the U.S., although a lot of chemical suppliers will refuse to provide it to individuals. It's easy to make,
though.
I think you can obtain red phosphorus, iodine and methylamine in the U.S.A. without paperwork as well, but it's technically illegal, and I think doing
so could lead to problems for the hobby chemist. Sodium borohydride is pretty easy to obtain here too and totally legal. Most toxic compounds can be
transported by ground transportation but not by air.
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Schleimsäure
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| Quote: Originally posted by JJay | Benzene isn't that hard to obtain in the U.S., although a lot of chemical suppliers will refuse to provide it to individuals. It's easy to make,
though.
I think you can obtain red phosphorus, iodine and methylamine in the U.S.A. without paperwork as well, but it's technically illegal, and I think doing
so could lead to problems for the hobby chemist. Sodium borohydride is pretty easy to obtain here too and totally legal. Most toxic compounds can be
transported by ground transportation but not by air. |
Indeed it is quite strange. Some reagents you are getting hold of better in the US, others in Germany. And the other way round.
50 years ago it was no problem in the US neither in Germany. You got essentially everthing in both nations. Sad times.
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Db33
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i have a package being sent from another country, it is not of any drugs or listed chemicals so im not sure if its normal but the USPS tracking
number says that it was Inbound into Customs. Is that normal?? Right below that it says Inbound Out of customs so maybe its reversed and it actually
left customs but was there briefly.
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JJay
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I've never actually had a package seized by customs, and I've imported several dozen packages. I've never actually tried importing any contraband.
Sometimes they do extra inspections, so you'll see "inbound into customs." When they are doing ordinary inspections, you'll see "arrival at sorting
center." Usually, it's not in the inspection area for very long, but their random inspection selection depends on a variety of factors, including (I
believe) how much trouble they expect with that exporter.
If they suspect that a substance you are importing might be contraband, they may have an analysis performed on it. To my knowledge, I've only ever had
that happen once with anything I was importing. It wasn't contraband, and they provided me with a copy of the analysis.
Unfortunately, items that go through "customs" are more likely to arrive broken. If they are mislabeled or shipped improperly, they are likely to be
in customs for longer. I've seen packages in customs for up to six weeks, but usually, they are there for a few days.
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brubei
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| Quote: Originally posted by Schleimsäure | Methylamine HCl 250g
Diethyl Malonate 250 ml
Propiophenone 250 ml
Bromobenzene 250 ml
GAA 2,5l
Catechol 250g
1,2 Dichlorobenzene 400ml
n-Butylamine 100ml
Cycloheyxylamine 100ml
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you forgot CH2Br2
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Schleimsäure
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[/rquote]you forgot CH2Br2[/rquote]
Why is that?
Actually the shop has it, but they want EUR 43 for 250ml which I would not pay.
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JJay
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Bromothymol blue, for titrations. I'm trying to figure out why phenolphthalein is so popular....
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j_sum1
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| Quote: Originally posted by JJay | Bromothymol blue, for titrations. I'm trying to figure out why phenolphthalein is so popular....
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Well, that one is easy. Phenolphthalein is such an intense colour and shows a very sudden change. You can detect a tinge of pink appearing a whole
lot more easily than a change from yellow to blue. Granted, the change for bromothymol blue occurs closer to neutrality: (pH 6.0-7.6 compared with
8.3-10.0 for phenolphthalein). But if you are titrating against a strong base (which is pretty common) that difference hardly matters.
I am a believer in having a few different indicators. (If only because some of them are cool compounds.) But the one I use most often is
phenolphthalein.
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JJay
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| Quote: Originally posted by j_sum1 | | Quote: Originally posted by JJay | Bromothymol blue, for titrations. I'm trying to figure out why phenolphthalein is so popular....
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Well, that one is easy. Phenolphthalein is such an intense colour and shows a very sudden change. You can detect a tinge of pink appearing a whole
lot more easily than a change from yellow to blue. Granted, the change for bromothymol blue occurs closer to neutrality: (pH 6.0-7.6 compared with
8.3-10.0 for phenolphthalein). But if you are titrating against a strong base (which is pretty common) that difference hardly matters.
I am a believer in having a few different indicators. (If only because some of them are cool compounds.) But the one I use most often is
phenolphthalein. |
That seems reasonable. Phenolphthalein is actually the only indicator I have right now aside from universal pH paper (which I also just ordered, 400
strips)... I definitely would like to have some others.
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gdflp
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| Quote: Originally posted by j_sum1 | | Well, that one is easy. Phenolphthalein is such an intense colour and shows a very sudden change. You can detect a tinge of pink appearing a whole
lot more easily than a change from yellow to blue. Granted, the change for bromothymol blue occurs closer to neutrality: (pH 6.0-7.6 compared with
8.3-10.0 for phenolphthalein). But if you are titrating against a strong base (which is pretty common) that difference hardly matters.
|
This is definitely the reason for the popularity of phenolphthalein in teaching labs. If you think bromothymol blue is bad, try methyl orange. It's
nearly impossible to tell when you're at the equivalence point without a spectrometer.
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ave369
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My last chemical purchase is a 5 liter jerrycan of 95% ethanol. It wasn't really an order, it was a black market purchase from a factory.
Smells like ammonia....
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Morgan
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My latest purchase - 5 gallons of methanol at $4.50 a gallon or $22.50 plus 7.5% sales tax.
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Praxichys
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250g Butylated hydroxytoluene
1 liter benzyl alcohol, USP
1 liter acetonitrile
1 liter cyclohexane
500g sodium fluoride
152g raw orpimement from Peru
1 liter dimethylformamide
1 gallon 93% sulfuric acid
1 lb silica flour
2 lb sodium hexametaphosphate
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JJay
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30% hydrogen peroxide. I am about to lose my piranha virginity. I guess it's like getting married?
Edit: misspelled piranha
[Edited on 7-2-2017 by JJay]
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