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Discord Now Fully Linked With 420chan IRC

Anorganic Chem Q

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- Wed, 18 Jan 2017 06:14:04 EST +xNTZBER No.78473
File: 1484738044507.png -(1001768B / 978.29KB, 734x1088) Thumbnail displayed, click image for full size. Anorganic Chem Q
So me and my colleague are arguing about whether KOH or NaOH is stronger base. While in practice it is not important, I'd argue that theoretically it must be KOH, as the enthalpy of K+ is lower, therefore KOH will be more likely to dissociate. However, the colleague is buzzing around with a dubious Pkbn from chembuddy which states that pKbn values for NaOH and KOH are 0.2 and 0.5 respectively, indicating that NaOH would in fact be a stronger base (and LiOH the strongest). Why would that be? Pls explain. pic unrel
2 posts omitted. Click View Thread to read.
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Bombastus !uYErosQbLM!!Mybq1UbK - Sat, 28 Jan 2017 01:26:18 EST ViNIYyYK No.78513 Reply
>>78512
You are right but that's a product, not a reason. The question is WHY it is more electronegative than potassium and the answer is ironic radius trends.

Where my electrons @@@@@@@@@?
>>
Eliza Grandwill - Sat, 28 Jan 2017 02:36:32 EST vukMbHQH No.78515 Reply
>>78512

That logic makes no sense to me; I would expect Potassium to be more likely to give up the ghost due it its relatively large electron cloud. The distance of the periphery of the electron cloud to the center of the atoms nucleus should allow easier access to its valence electrons, no?

Which is why pure cesium reacts so violently in water in comparison to lithium, sodium, and potassium.

I guess what I'm saying is NaOH being stronger than KOH goes against my intuition.
>>
Eliza Grandwill - Sat, 28 Jan 2017 02:41:50 EST vukMbHQH No.78516 Reply
Nvm, I gets it.

The ionic association of potassium is stronger than sodium with anions, so you would expect less dissociation as the alkali metals get heavier.

Introduction to /chem/

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- Wed, 17 Aug 2016 05:46:46 EST rX48mQ3L No.78159
File: 1471427206573.jpg -(551642B / 538.71KB, 2101x2560) Thumbnail displayed, click image for full size. Introduction to /chem/
Hello, I am a newcomer to this board but it seems cozy enough for me to stay here. It is a dream for me to make a home-lab one day, because univeristy labs (studying medicine) have restrictions and objections against experiments that I'm interested at.

It would be nice if you could tell more about your setups/projects/goals.

>also general current project thread
5 posts and 2 images omitted. Click View Thread to read.
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breakabond - Sun, 05 Mar 2017 10:37:18 EST LObRvGV/ No.78588 Reply
just a test:
>fuckin tolerance

E=MC^2 question

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- Thu, 22 Dec 2016 12:08:21 EST E5ztys4h No.78408
File: 1482426501194.jpg -(953131B / 930.79KB, 1600x780) Thumbnail displayed, click image for full size. E=MC^2 question
So I was randomly thinking about Einsteins most popular contribution to physics, and I have a problem with it:

If E=MC^2, then how is it possible that a mass-less photon can carry any energy?

I expect there's probably a well established answer to this, but in trying to track it down I'm realizing a lot of this stuff is well above my reading level.
14 posts and 1 images omitted. Click View Thread to read.
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Bombastus !uYErosQbLM!!Mybq1UbK - Thu, 12 Jan 2017 02:03:23 EST 8NEuSnNe No.78465 Reply
>>78462
Thanks! Those threads have more or less died at this point. My experiences with psychedelics is on hiatus since I my consecutive ego deaths on like 750 LSD, 35mg 2-CE, 125mg 4-AcO-DMT, and other doses similar.

That shit actually scares me to the point where weed gives me intense spiritual flashbacks and really need to take a break. Times a changed, I guess. I'll be back soon, though.

Keep grooving in the meantime and ask any question whatsoever.
>>
Bombastus !uYErosQbLM!!Mybq1UbK - Sun, 22 Jan 2017 23:00:43 EST iygy/n6D No.78494 Reply
>>78465
damn where'd that response go to this post. i was gonna response to it too

Guy who wanted to mix two solids for X-Ray analysis

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!uYErosQbLM!!Mybq1UbK - Fri, 20 Jan 2017 14:52:25 EST jTCURNhV No.78483
File: 1484941945945.jpg -(137980B / 134.75KB, 809x656) Thumbnail displayed, click image for full size. Guy who wanted to mix two solids for X-Ray analysis
I guess because of a certain news article, we can't discuss specific molecules like that here............ I suppose the molecule in question is attracting too much media attention so even on a small board such as this, it is unwise to do so?

Sorry anon for killing your thread for asking for specifics.

Where are the fucking units

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!!D0XjIgKF - Fri, 13 Jan 2017 10:55:34 EST zsw9I8fO No.78467
File: 1484322934943.jpg -(11152B / 10.89KB, 257x136) Thumbnail displayed, click image for full size. Where are the fucking units
Can someone tell me what the units here are?
(<-- image)

source: http://www.pharmpress.com/files/docs/Excipients7e_samplemonos(1).pdf
1 posts omitted. Click View Thread to read.
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trypto - Fri, 13 Jan 2017 11:20:10 EST ltcKYWSL No.78469 Reply
>>78468
Whoops. Actually, not mass percent since it's not multiplied by 100. Mass ratio?

Denatured alcohol

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- Mon, 26 Dec 2016 15:26:13 EST H7AhQjrZ No.78423
File: 1482783973025.png -(231824B / 226.39KB, 331x522) Thumbnail displayed, click image for full size. Denatured alcohol
I have this product (see image), and I evaporated a few drops on a clean mirror and it left a noticeable residue.

In the SDS (https://www.korellis.com/wordpress/wp-content/uploads/2016/05/Alcohol-Denatured.pdf) it only lists methanol and ethanol as components, so what is the residue left behind, and how harmful would it be to consume?
6 posts omitted. Click View Thread to read.
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Shitting Mimmlefirk - Thu, 05 Jan 2017 12:57:20 EST kquaKHd6 No.78445 Reply
Looking @ page 3, subsection 3 of that msds:

Ethanol concentration is 30-50%
Methanol concentrate is 40-60%

So, the ethanol/methanol mixture will make up between 110% and 70% of what's in that can. The other 30%? Prolly shit from wood when they made this 'wood alcohol'
>>
Shitting Mimmlefirk - Thu, 05 Jan 2017 13:07:13 EST kquaKHd6 No.78446 Reply
Honestly, it's probably exactly the sort of thing that you don't want to go into your body. As in, Exactly. Polyaromatic hydrocarbons, heavy metals, sulfur and nitrogen compounds. Everything that's bad except for biologically derived venoms.
>>
Martha Nicklewill - Thu, 12 Jan 2017 23:07:52 EST DZQn4yU5 No.78466 Reply
>>78446
They do this on purpose to make money from alcohol tax.

Pretty sure it's not listed on the MSDS and it distills over at similair temps.

DIY Batteries

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- Tue, 10 Jan 2017 11:48:31 EST 32cXOz64 No.78461
File: 1484066911864.png -(1801389B / 1.72MB, 863x1343) Thumbnail displayed, click image for full size. DIY Batteries
sup /chem/,

Looking for some decent DIY battery ideas. Doesn't have to be too compact, but I would like for it to fit on a desk perhaps and be able to shit out roughly 1.5-3.5V and maybe max ~25mA.

I've tried my had at a few types (pic related: quick dirty Earth battery with copper and zinc cathode/anodes) including earth (using several combos of cath/anodes), zinc-air, Al-air, and am setting up to create a MnO2+Alum/graphite cell just to test.

Question: What are some decent DIY battery builds? I'm not asking for any steps, simply just metal combos and whatever medium suites said combo. The charge density isn't all that important as it's to be expected to need to be recharged/reloaded. I'm certain with another cathode/anode in the Earth Battery pictured and a simple joule thief, I could squeeze out around 1.5V (haven't checked the amps yet). The idea here is just to get more ideas for DIY batteries and perhaps ideas for better performance. I'm aware of galvanic series and electrical potential, so I believe this thread is best suited for discussion and possibly personal experience.

Cheers
>>
trypto - Wed, 11 Jan 2017 21:28:31 EST ltcKYWSL No.78463 Reply
I think some type of lead-acid battery would be best. I don't have any experience with it, but it sounds like a cool project.

Solubility

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- Tue, 03 Jan 2017 12:29:11 EST 2qfcsxJx No.78437
File: 1483464551616.jpg -(8271B / 8.08KB, 250x250) Thumbnail displayed, click image for full size. Solubility
I recently did some undergraduate research with a professor in organic synthesis and was curious about what the factors for solubility are. I was under the impression that it was all about size and polarity, but i'm getting conflicting results. I had synthesized several molecules which had phenyl groups. Since this was some discovery chemistry, I made "copies" of these molecules but with substitutions at the para positions of the aromatic ring in order to increase reactivity through electron withdrawing effects (para-nitro substitution) or decrease reactivity through electron donating effects (para-methoxy substitution).

What I noticed was that my molecule which had two phenyl rings with para-substituted nitro groups was more polar than the same molecule with no substitution (least polar) and that with the para-methoxy (middle polarity), but it had the worst solubility of the three.

In fact, the one with the unsubstituted aromatic rings was the most soluble in methanol, despite being the least polar.

What factors are at play here? the nitro compound basically only dissolved decently in DCM, which made working with it incredibly frustrating. Yet slightly more or less polar solvents didn't or barely worked to dissolve it. I'd like to know what factors to consider for the next time I work in a lab so I can more easily predict some of the properties of the molecules I'll be synthesizing.
2 posts and 1 images omitted. Click View Thread to read.
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Esther Sarringlane - Fri, 06 Jan 2017 13:36:53 EST zsw9I8fO No.78449 Reply
>>78444
So if we have all these equations for solubility, how hard is it to throw it all into a program where you draw any molecule and find out what it's soluble in (and how soluble).
>>
trypto - Sat, 07 Jan 2017 00:04:32 EST ltcKYWSL No.78457 Reply
>>78449
It's faster to simply use a rule of thumb, and try 3-6 of the common lab solvents before you find the best solvent (and how soluble it is).

If you really wanted to do it computationally, then you'd need a great graphics card, and a workflow for DFT calculations. There's a handful of programs used for this, and they all have a high learning curve. Spartan is probably the easiest, though it's closed source and expensive. I don't know the exact steps needed.

In general, it's pretty hard.
>>
trypto - Sat, 07 Jan 2017 00:09:24 EST ltcKYWSL No.78458 Reply
>>78457
Actually, Amazon ec2 would be better than a good graphics card. But you'd still want a decent card for when you're leanring.

Climate Metric

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- Sun, 01 Jan 2017 23:14:21 EST VjvGmScF No.78431
File: 1483330461439.jpg -(18218B / 17.79KB, 529x163) Thumbnail displayed, click image for full size. Climate Metric
Imagine you have a big list of cities and wanted to concisely get an idea of what the weather is like over there.
If conciseness and speed wasn't a problem, you could look at a graph like that for each city, but that's not feasible.

So what metrics would you need to accurately capture the climate of that area? Less is better, so all I can think of is: average lowest temp, average highest temp.
Any other ideas?
9 posts omitted. Click View Thread to read.
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Barnaby Samblewell - Thu, 12 Jan 2017 00:52:43 EST Q+12w2DB No.78464 Reply
>how do i climate

nb.

lifespan

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- Sat, 24 Dec 2016 05:44:01 EST RKOZdJ0v No.78416
File: 1482576241169.png -(23568B / 23.02KB, 365x619) Thumbnail displayed, click image for full size. lifespan
sorry for the stupid question, chemistry is def my weakest area

a search tells me that PG USP/EP has a shelf life of two years when stored below 40°C (104°F) in closed containers away from sources of ultraviolet (UV) light.
should i only make enough solution to last a couple years? how long can refrigeration extend this?
2 posts and 1 images omitted. Click View Thread to read.
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John Semmerforth - Mon, 26 Dec 2016 04:09:20 EST RKOZdJ0v No.78422 Reply
>>78420
thanks!

>>78421
i'm getting a quantity of a research chemical large enough to outlive its legal status (presumably)
i know i can just... keep them not mixed, but i wanted to know if mixing would make the situation worse or not
>>78420
>>
David Noblingchene - Thu, 29 Dec 2016 00:56:04 EST Fe+cUsBQ No.78426 Reply
>>78422
You will not regret keeping your entire stash out of solution. Isn't that enough?

Mescaline Creation

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!!HToBa9dh - Fri, 21 Aug 2015 17:13:58 EST 4ppVjZXo No.76958
File: 1440191638629.jpg -(42448B / 41.45KB, 460x422) Thumbnail displayed, click image for full size. Mescaline Creation
I just proposed this on /psy/ so let's see what you people think.
>>>/psy/839044

I do have an add-on, though. L-Tyrosine can be decarboxylated to Tyramine so you don't have to get a shitload of cheese to extract. From there, you can just brominate it selectively in basic conditions to brominate the carbons meta to the hydroxide. A simple LG > Hydroxide reaction later, you'll have 2,3,4 tri-hydroxyl(aminoethyl)benzene.

One simple reflux with 4eq of Methyliodide should yield mescaline in 95%+ yields. What do you think, /chem/?
78 posts and 16 images omitted. Click View Thread to read.
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Nell Gecklecocke - Fri, 23 Dec 2016 23:17:17 EST DPjhXpIm No.78415 Reply
>>76973
A good old methylamination with benzaldehyde then a reduction for some trimethoxyamphetamine, a 1000 percent increse in potentcy.
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Schepperschop - Sat, 24 Dec 2016 13:33:31 EST xTIigKo1 No.78417 Reply
Find the cactus>>Eat the cactus
>>
press - Sun, 25 Dec 2016 11:24:27 EST Hzvahzwj No.78419 Reply
>>78415
i think you mean a henry condensation with a following reduction?

tfw calmus oil is expenis as fuck and you cant just go via reductive amination for tma2

Solubility question

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- Sat, 24 Dec 2016 18:26:32 EST 750GEpVs No.78418
File: 1482621992333.png -(491474B / 479.96KB, 500x484) Thumbnail displayed, click image for full size. Solubility question
Is α-Methylfentanyl alcohol soluble, or is there something else you'd recommend?

TiCl4

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- Fri, 15 Jul 2016 00:06:30 EST 2+q0LcOC No.78094
File: 1468555590148.jpg -(24503B / 23.93KB, 530x297) Thumbnail displayed, click image for full size. TiCl4
If Ti has the follow electron config as a base config: (where ^ represents an e-)

^^ ^ ^
4s 3d 3d 3d 3d 3d

would it hybridise to the following (to accommodate (Cl-)4)?
^ ^ ^ ^
sp3d sp3d sp3d sp3d sp3d

leaving it with a final config of (with bonded (Cl-)4):
^ ^ ^ ^ ^ ^ ^ ^
sp3d sp3d sp3d sp3d sp3d

thereby classifying it as a lewis acid because it can accept a lone pair?
i hope this makes sense
cheers

pic unrelated
2 posts omitted. Click View Thread to read.
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Isabella Sullyshaw - Sun, 24 Jul 2016 13:14:18 EST R8K15vkj No.78110 Reply
use pre tags for
m o n o s p a c e
>>
levi - Mon, 19 Dec 2016 08:54:13 EST 2kHGLnfS No.78406 Reply
hey man not sure im following you exactly, but it would be much easier to think of this in terms of CFT/ligand field model, as in 4 M-L bonding interactions lying lower in energy than the metal based d-orbitals (e and t2 sets) which have an occupancy of 4. Electronically speaking TiCl4 has low-lying MO's, of primarly Ti character, so yeah it is fairly electrophilic and a decent lewis acid. evidenced in that it happily forms adducts with donor solvents such as THF

Salt

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- Wed, 07 Dec 2016 16:09:37 EST mswwHH6I No.78386
File: 1481144977392.jpg -(169265B / 165.30KB, 1000x744) Thumbnail displayed, click image for full size. Salt
in a context of conducting a synthesis, does it matter whether a reagent is in a form of a salt or not? can you even make such a general statement?

i'm asking because im interested in the chemistry behind converting codeine phosphate to morphine. does it matter whether someone uses codeine phosphate or codeine freebase?

pic unrelated
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James Lightspear - Sun, 11 Dec 2016 23:56:05 EST 9Opqdgsf No.78397 Reply
Depends on the solvent your going to carry out your reaction in. In most cases i can think of the freebase is required. Careful, codeine is easily destroyed by strong acids and bases. Hell, even heat and a little too much ammonia will do it. Also too much water and it will stay in the aqueous layer. Work as small as you can because 9 times of of 10 you will have failures.

codeine 300g/mol
codeine phos 397g/mol
ammonia 17g/mol
sodium carbonate 106g/mol

0.001mol 1mmol codeine phosphate = 397mg
add 1mmol ammonia = 17mg or 170mg 10% ammonia
or add 0.5mmol carbonate because there are 2 sodiums = 53mg
and you should be left with 300mg codeine

In reality you will likely need a little more base in many cases, but it gives you a general idea how much to start with.
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Schepperschop - Wed, 14 Dec 2016 18:16:13 EST xTIigKo1 No.78404 Reply
Want morphine?
Ask Papaver!
That difficult?
Not really.

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