I would like to know more View Thread Reply Hide Cornelius Sinnerfut - Wed, 22 Feb 2017 11:05:12 EST tYqZ8S2V No.78537 File: 1487779512722.jpg -(397458B / 388.14KB, 2244x1983) Thumbnail displayed, click image for full size. Is powdering a carpet with Borax a good way to kill carpet beetles without killing the occupying human? >> William Bocklewell - Wed, 22 Feb 2017 12:29:43 EST 4tmtdVyg No.78538 Reply I've used borax to assassinate the ant queen(s) before. Mix it 1/3 parts borax, 1/3 part sugar, 1/3 part hot water. Let it cool then let the sugar solution sit out in a flat dish or something. I dunno if beetles are as sensitive to borax, but I'm sure they don't have a processing method for borax. >> Angus Wiblingdock - Mon, 06 Mar 2017 16:37:04 EST Ja2fAPPl No.78594 Reply Borax will kill the bugs but any eggs they leave behind will be spared. You'll have to continuously reapply over months to get rid of all of them.
>> William Bocklewell - Wed, 22 Feb 2017 12:29:43 EST 4tmtdVyg No.78538 Reply I've used borax to assassinate the ant queen(s) before. Mix it 1/3 parts borax, 1/3 part sugar, 1/3 part hot water. Let it cool then let the sugar solution sit out in a flat dish or something. I dunno if beetles are as sensitive to borax, but I'm sure they don't have a processing method for borax.
>> Angus Wiblingdock - Mon, 06 Mar 2017 16:37:04 EST Ja2fAPPl No.78594 Reply Borax will kill the bugs but any eggs they leave behind will be spared. You'll have to continuously reapply over months to get rid of all of them.
Vaping Safety Questions View Thread Reply Hide breakabond - Tue, 07 Feb 2017 04:15:28 EST LObRvGV/ No.78523 File: 1486458928741.jpg -(59137B / 57.75KB, 1200x630) Thumbnail displayed, click image for full size. I'm going to describe a process and ask some questions at the end (though any helpful feedback is good)heroin dissolved in isopropyl alcoholbaking soda addedcaffeine about 1:1 to lower MPiso evaporated onto foilThe end result way too baking soda and some went into my throat in scalding liquid form. Good thing heroin kills pain.what's that called when two substances are mixed to create a lower boiling point?Is it safe to vape that baking soda?If I used soda ash, would it be safe to vape that too?any recommendations? >> breakabond - Tue, 07 Feb 2017 04:20:53 EST LObRvGV/ No.78524 Reply 1486459253103.jpg -(32054B / 31.30KB, 549x383) Thumbnail displayed, click image for full size. would acetone be better?is caffeine soluble in acetone?what about heroin?what about baking soda? >> Press - Tue, 07 Feb 2017 17:17:30 EST vUcWj3D5 No.78525 Reply Its called freezing point depression. Pretty cool shit, back inna days people determined purity and molecular weight with that effect.Vaping either baking powder or any inorganic nontoxic base wont be a problem unless you inhale too hard.Concerning the solvent, just look for the swg drugs heroin dossier( guess thats what your chart is based on?) or someother tables to check which solvent is useable for both the HCl and the freebase. You dont have to add the caffeine while thd h is still is in solution as long as you mix it thoroughlyId recommend using as little solvent as possible while not slowing the dissolution of the base down too much and installing gentoo just to be safe >> breakabond - Wed, 08 Feb 2017 00:27:51 EST LObRvGV/ No.78526 Reply That chart is from the swdrug. We dont have acetone solubiltiy info afaik then. ill stick with IPA
>> breakabond - Tue, 07 Feb 2017 04:20:53 EST LObRvGV/ No.78524 Reply 1486459253103.jpg -(32054B / 31.30KB, 549x383) Thumbnail displayed, click image for full size. would acetone be better?is caffeine soluble in acetone?what about heroin?what about baking soda?
>> Press - Tue, 07 Feb 2017 17:17:30 EST vUcWj3D5 No.78525 Reply Its called freezing point depression. Pretty cool shit, back inna days people determined purity and molecular weight with that effect.Vaping either baking powder or any inorganic nontoxic base wont be a problem unless you inhale too hard.Concerning the solvent, just look for the swg drugs heroin dossier( guess thats what your chart is based on?) or someother tables to check which solvent is useable for both the HCl and the freebase. You dont have to add the caffeine while thd h is still is in solution as long as you mix it thoroughlyId recommend using as little solvent as possible while not slowing the dissolution of the base down too much and installing gentoo just to be safe
>> breakabond - Wed, 08 Feb 2017 00:27:51 EST LObRvGV/ No.78526 Reply That chart is from the swdrug. We dont have acetone solubiltiy info afaik then. ill stick with IPA
How much Sodium Carbonate -> basify View Thread Reply Hide breakabond !!D0XjIgKF - Sat, 21 Jan 2017 01:17:05 EST zsw9I8fO No.78484 File: 1484979425963.jpg -(34039B / 33.24KB, 513x392) Thumbnail displayed, click image for full size. How much sodium carbonate would convert 1 molecule of Heroin HCl, or wait, would it be Acetate, yeah.How much sodium carbonate 1 molecule Heroin acetate -> Heroin base. 9 posts and 2 images omitted. Click View Thread to read. >> Oliver Fanforth - Tue, 24 Jan 2017 01:24:46 EST LObRvGV/ No.78497 Reply >>78493Okay so the solution to avoiding the accidental morphine production then is to perhaps use a weaker base (is ammonia weaker? maybe just baking soda) and quickly extract it afterwards? >> Bombastus !uYErosQbLM!!Mybq1UbK - Tue, 24 Jan 2017 01:34:48 EST Req4jw5M No.78498 Reply >>78496Deprotection. Sorry, I was /benz/ed as shit when I decided to legitpost on a few boards. I mean, the information is still good.Fuck I should teach more when I'm benzed no i really shouldn'tNo. You use as little water as possible with an ice bath and then do a vacuum filtration when the freebase precipitates. I don't see why an extraction after freebasing wouldn't work. However, I don't really work with that stuff as much and have no idea if it acts like morphine chemically (it shouldn't due to no active OH groups). Alternatively, You could do the boil down and then acetylate the morphine back into diamorphine.I'm too chemical, though. I would look up conversion between #3 and #4 or whatever on the internet. Homebaking is much easier than what I would do. >> breakabond - Tue, 07 Feb 2017 01:18:50 EST LObRvGV/ No.78522 Reply So I used sodium carbonate super-saturated (pH was ~10-11) then added some heroin salt -> tried using hexane to extract it -> evaporated.Evaporating is always the worst step for me, because unless you're doing a massive batch, you end up with such a small amount of freebase residue, so for max efficiency I try to evaporate directly onto foil, which means I try to make a wide dish out of foil, which often ends up breaking and leaking all over my desk, BUT when it does work Im able to vape right off that foil. The alternative would be to put it solid container, but there's ALWAYS some waste when you try to scrape it all up.So did it get me high? barely. Not enough. Wasteful.
>> Oliver Fanforth - Tue, 24 Jan 2017 01:24:46 EST LObRvGV/ No.78497 Reply >>78493Okay so the solution to avoiding the accidental morphine production then is to perhaps use a weaker base (is ammonia weaker? maybe just baking soda) and quickly extract it afterwards?
>> Bombastus !uYErosQbLM!!Mybq1UbK - Tue, 24 Jan 2017 01:34:48 EST Req4jw5M No.78498 Reply >>78496Deprotection. Sorry, I was /benz/ed as shit when I decided to legitpost on a few boards. I mean, the information is still good.Fuck I should teach more when I'm benzed no i really shouldn'tNo. You use as little water as possible with an ice bath and then do a vacuum filtration when the freebase precipitates. I don't see why an extraction after freebasing wouldn't work. However, I don't really work with that stuff as much and have no idea if it acts like morphine chemically (it shouldn't due to no active OH groups). Alternatively, You could do the boil down and then acetylate the morphine back into diamorphine.I'm too chemical, though. I would look up conversion between #3 and #4 or whatever on the internet. Homebaking is much easier than what I would do.
>> breakabond - Tue, 07 Feb 2017 01:18:50 EST LObRvGV/ No.78522 Reply So I used sodium carbonate super-saturated (pH was ~10-11) then added some heroin salt -> tried using hexane to extract it -> evaporated.Evaporating is always the worst step for me, because unless you're doing a massive batch, you end up with such a small amount of freebase residue, so for max efficiency I try to evaporate directly onto foil, which means I try to make a wide dish out of foil, which often ends up breaking and leaking all over my desk, BUT when it does work Im able to vape right off that foil. The alternative would be to put it solid container, but there's ALWAYS some waste when you try to scrape it all up.So did it get me high? barely. Not enough. Wasteful.
Changing Carbon to Silicon for new life View Thread Reply Hide Frigate - Tue, 24 Jan 2017 17:41:29 EST B2LKOBQC No.78499 File: 1485297689266.png -(20193B / 19.72KB, 1008x630) Thumbnail displayed, click image for full size. So me and this girl on one of my classes had come up with substituting Carbon for Silicon that we could get a new form of life, but one of our teachers said it was unbalanced. What does she mean? 5 posts and 2 images omitted. Click View Thread to read. >> Frigate - Wed, 25 Jan 2017 17:44:20 EST B2LKOBQC No.78505 Reply >>78500But why tho? I never stated anything about their bonds. I meant they are similar. My main question was why it was unbalanced. >> Charlotte Drablingspear - Fri, 27 Jan 2017 21:49:13 EST klMiQ9iI No.78511 Reply I remember reading somewhere that scientists were able to genetically engineer a bacteria that was able to create silicon bonds, to demonstrate that silicon-based lifeforms are possible and could maybe be found somewhere else in the universe. However I do not believe that they got so far as to create a glucose molecule with silicon instead of carbons. That kind of science is probably decades or centuries away. The reaction you have there is "balanced" in the sense that there are equal numbers of each atom on both sides of the equation. I think your teacher was just trying to tell you that you are full of shit. >> Esther Bublingstick - Tue, 31 Jan 2017 21:59:07 EST FMRNgMnb No.78518 Reply 1485917947505.jpg -(69479B / 67.85KB, 800x351) Thumbnail displayed, click image for full size. >>78505The electronegativity. Si forms sissy bonds compared to carbon. It's a harsh universe out there... lots of O2 and water. Without the strength and versitility of the carbon bond, silicon based lifeforms would get wrecked by the simplest forces of nature.
>> Frigate - Wed, 25 Jan 2017 17:44:20 EST B2LKOBQC No.78505 Reply >>78500But why tho? I never stated anything about their bonds. I meant they are similar. My main question was why it was unbalanced.
>> Charlotte Drablingspear - Fri, 27 Jan 2017 21:49:13 EST klMiQ9iI No.78511 Reply I remember reading somewhere that scientists were able to genetically engineer a bacteria that was able to create silicon bonds, to demonstrate that silicon-based lifeforms are possible and could maybe be found somewhere else in the universe. However I do not believe that they got so far as to create a glucose molecule with silicon instead of carbons. That kind of science is probably decades or centuries away. The reaction you have there is "balanced" in the sense that there are equal numbers of each atom on both sides of the equation. I think your teacher was just trying to tell you that you are full of shit.
>> Esther Bublingstick - Tue, 31 Jan 2017 21:59:07 EST FMRNgMnb No.78518 Reply 1485917947505.jpg -(69479B / 67.85KB, 800x351) Thumbnail displayed, click image for full size. >>78505The electronegativity. Si forms sissy bonds compared to carbon. It's a harsh universe out there... lots of O2 and water. Without the strength and versitility of the carbon bond, silicon based lifeforms would get wrecked by the simplest forces of nature.
Anorganic Chem Q View Thread Reply Hide Cedric Lightfield - 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. 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. >> Bombastus !uYErosQbLM!!Mybq1UbK - Sat, 28 Jan 2017 01:26:18 EST ViNIYyYK No.78513 Reply >>78512You 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 >>78512That 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.
>> Bombastus !uYErosQbLM!!Mybq1UbK - Sat, 28 Jan 2017 01:26:18 EST ViNIYyYK No.78513 Reply >>78512You 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 >>78512That 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/ View Thread Reply Hide Synapse - 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. 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. >> Thomas Cingerfield - Thu, 26 Jan 2017 01:45:25 EST /1/rkG3K No.78506 Reply 1485413125092.png -(678278B / 662.38KB, 740x755) Thumbnail displayed, click image for full size. >>78398Bump >> Bombastus !uYErosQbLM!!Mybq1UbK - Fri, 27 Jan 2017 00:42:56 EST zWHMkUyt No.78509 Reply >>78506sup >> breakabond - Sun, 05 Mar 2017 10:37:18 EST LObRvGV/ No.78588 Reply just a test:>fuckin tolerance
>> Thomas Cingerfield - Thu, 26 Jan 2017 01:45:25 EST /1/rkG3K No.78506 Reply 1485413125092.png -(678278B / 662.38KB, 740x755) Thumbnail displayed, click image for full size. >>78398Bump
>> Bombastus !uYErosQbLM!!Mybq1UbK - Fri, 27 Jan 2017 00:42:56 EST zWHMkUyt No.78509 Reply >>78506sup
E=MC^2 question View Thread Reply Hide Martin Crepperfuck - 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. 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. >> Bombastus !uYErosQbLM!!Mybq1UbK - Thu, 12 Jan 2017 02:03:23 EST 8NEuSnNe No.78465 Reply >>78462Thanks! 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. >> Rebecca Wemmerwot - Sun, 22 Jan 2017 09:04:53 EST 6+KMGshk No.78492 Reply >>78456lol oops >> Bombastus !uYErosQbLM!!Mybq1UbK - Sun, 22 Jan 2017 23:00:43 EST iygy/n6D No.78494 Reply >>78465damn where'd that response go to this post. i was gonna response to it too
>> Bombastus !uYErosQbLM!!Mybq1UbK - Thu, 12 Jan 2017 02:03:23 EST 8NEuSnNe No.78465 Reply >>78462Thanks! 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 >>78465damn 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 View Thread Reply Hide Bombastus !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. 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 View Thread Reply Hide breakabond !!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. 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. >> trypto - Fri, 13 Jan 2017 11:20:10 EST ltcKYWSL No.78469 Reply >>78468Whoops. Actually, not mass percent since it's not multiplied by 100. Mass ratio? >> Bombastus !uYErosQbLM!!Mybq1UbK - Sat, 14 Jan 2017 00:36:57 EST YTE4hsRA No.78470 Reply >>78467I looked this shit up and it's g in ml. https://pubchem.ncbi.nlm.nih.gov/compound/D-mannitol#section=2D-StructureStrictly speaking, if I saw this in a research paper, I would think that it said 1 molecule of mannitol dissolves in x molecules of the solvent. This is very lazy of the people who made this. >> breakabond !!D0XjIgKF - Sat, 14 Jan 2017 05:57:36 EST zsw9I8fO No.78471 Reply 1484391456037.jpg -(20090B / 19.62KB, 500x375) Thumbnail displayed, click image for full size. >>78470
>> trypto - Fri, 13 Jan 2017 11:20:10 EST ltcKYWSL No.78469 Reply >>78468Whoops. Actually, not mass percent since it's not multiplied by 100. Mass ratio?
>> Bombastus !uYErosQbLM!!Mybq1UbK - Sat, 14 Jan 2017 00:36:57 EST YTE4hsRA No.78470 Reply >>78467I looked this shit up and it's g in ml. https://pubchem.ncbi.nlm.nih.gov/compound/D-mannitol#section=2D-StructureStrictly speaking, if I saw this in a research paper, I would think that it said 1 molecule of mannitol dissolves in x molecules of the solvent. This is very lazy of the people who made this.
>> breakabond !!D0XjIgKF - Sat, 14 Jan 2017 05:57:36 EST zsw9I8fO No.78471 Reply 1484391456037.jpg -(20090B / 19.62KB, 500x375) Thumbnail displayed, click image for full size. >>78470
Denatured alcohol View Thread Reply Hide Martha Brookdale - 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. 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. >> 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 >>78446They 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.
>> 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 >>78446They 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 View Thread Reply Hide Nicholas Wibbleson - 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. 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.
>> 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 View Thread Reply Hide Nell Dannerworth - 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. 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. >> Esther Sarringlane - Fri, 06 Jan 2017 13:36:53 EST zsw9I8fO No.78449 Reply >>78444So 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 >>78449It'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 >>78457Actually, Amazon ec2 would be better than a good graphics card. But you'd still want a decent card for when you're leanring.
>> Esther Sarringlane - Fri, 06 Jan 2017 13:36:53 EST zsw9I8fO No.78449 Reply >>78444So 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 >>78449It'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 >>78457Actually, 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 View Thread Reply Hide Jack Sopperham - 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. 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. >> Edward Blussledon - Sat, 07 Jan 2017 23:36:23 EST zsw9I8fO No.78459 Reply cmonnnnnnnnnnn >> Barnaby Samblewell - Thu, 12 Jan 2017 00:52:43 EST Q+12w2DB No.78464 Reply >how do i climatenb. >> breakabond !!D0XjIgKF - Sat, 21 Jan 2017 01:20:39 EST zsw9I8fO No.78485 Reply 1484979639371.jpg -(136536B / 133.34KB, 1024x765) Thumbnail displayed, click image for full size. tada: https://en.wikipedia.org/wiki/K%C3%B6ppen_climate_classification
>> breakabond !!D0XjIgKF - Sat, 21 Jan 2017 01:20:39 EST zsw9I8fO No.78485 Reply 1484979639371.jpg -(136536B / 133.34KB, 1024x765) Thumbnail displayed, click image for full size. tada: https://en.wikipedia.org/wiki/K%C3%B6ppen_climate_classification
lifespan View Thread Reply Hide Priscilla Drucklemidge - 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. sorry for the stupid question, chemistry is def my weakest areaa 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. >> John Semmerforth - Mon, 26 Dec 2016 04:09:20 EST RKOZdJ0v No.78422 Reply >>78420thanks!>>78421i'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 >>78422You will not regret keeping your entire stash out of solution. Isn't that enough? >> Clara Dablingmick - Thu, 29 Dec 2016 18:26:59 EST RKOZdJ0v No.78428 Reply >>78426it is! just curious!
>> John Semmerforth - Mon, 26 Dec 2016 04:09:20 EST RKOZdJ0v No.78422 Reply >>78420thanks!>>78421i'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 >>78422You will not regret keeping your entire stash out of solution. Isn't that enough?
>> Clara Dablingmick - Thu, 29 Dec 2016 18:26:59 EST RKOZdJ0v No.78428 Reply >>78426it is! just curious!
