Sciencemadness Discussion Board

Pretty Pictures (2)

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Fyndium - 22-9-2020 at 03:12

Quote: Originally posted by Pok  
Pure hydrogen cyanide


Did you produce this yourself? If, how did you packed and sealed it?

Meanwhile, cleaning and drying a small batch of acetone.





cleaning.jpg - 1.9MB

[Edited on 22-9-2020 by Fyndium]

Lion850 - 22-9-2020 at 16:15

Cobalt formate crystals forming as the solution cools

F7B39C11-DB82-4AF2-B4F0-359D2576D51A.jpeg - 2.4MB

arkoma - 27-9-2020 at 10:22

Rounded up eight old school mercury switches:

IMG_20200927_130636_068_hdr.jpg - 128kB

Yield of mercury:


IMG_20200927_131212_152_hdr.jpg - 165kB IMG_20200927_131358_989_hdr.jpg - 159kB

I didn't have any mercury, so this was a cool find!

MidLifeChemist - 2-10-2020 at 08:57

some Lead Iodide from yesterday



[Edited on 2-10-2020 by MidLifeChemist]

lead-iodide3-1.jpg - 541kB

mayko - 2-10-2020 at 13:39

These were sights for sore eyes to me... I'd been fighting a losing battle against tomato hornworms in my garden. The little monsters are devastating! Things turned around when I learned that they're actually fluorescent under ultraviolet light. I can go out at night with my uv flashlight and just pick them off the plants!

glowingHornworm.jpg - 45kB

I don't kill all of them, though. I found a couple that were completely still and had these white things sticking out of their backs. It turns out those have been parasitized by a specialist wasp. Since they're no longer chomping and they're hosting beneficial insect predators, these can stay

InfectedWorm.jpg - 73kB

The more I looked into this wasp the weirder things got. Apparently it actually carries an endogenous virus in its genome, which it uses to infect the caterpillar as part of the parasitic process. Most of the time a virus genome is compact to the point of heavy overprinting, but this virus contained not only considerable noncoding sequence, but also introns! This, and a few other odd facts have led to the idea that it might actually be a new virus in the process of emergence, rather than an ancient insertion. :o

Attachment: Espagne et al. - 2004 - Genome sequence of a polydnavirus Insights into symbiotic virus evolution.pdf (189kB)
This file has been downloaded 160 times




It also turns out there is a second wasp which parasitizes the first, a situation called hyperparasitism. It's a hyperpest!!




CharlieA - 2-10-2020 at 16:31

Quote: Originally posted by arkoma  
Rounded up eight old school mercury switches:


I bought a bunch of small switches ("tilt" switches, maybe) some time ago, but I haven't decided how I want to break them. I suspect I'll get more powdered glass than Hg!

arkoma - 2-10-2020 at 23:05

I cracked them on one end, held down in a beaker, with a pair of pliers. The bits of glass that fell in with the mercury was no problem, as it doesn't "wet". The mercury poured off clean.

B(a)P - 2-10-2020 at 23:55

I find if you hold them by the wire connections, with the wire connections pointing down. Then use side cutters to take the to off. Then pour the mercury into you breaker. I have opened many switched and this has always worked well.

Fyndium - 13-10-2020 at 08:07

Am I the only one who gets breaking bad vibes from these CaCl2 hexahydrate crystals? :cool:

cacl2.jpg - 448kB

Bezaleel - 15-10-2020 at 14:23

Quote: Originally posted by Lion850  
Cobalt formate crystals forming as the solution cools

Wow, looks like solidifying raspberry syrup. Yummy!
Is cobalt formate hygroscopic, or could you grow crystals from it?

Bezaleel - 15-10-2020 at 14:41

I just love these for their colour

Cobalt(II)orthomolybdate (left) and molybdatocobaltate(III) (right)

20201015_144852_detail.jpg - 615kB 20201015_144946_detail.jpg - 724kB

Fyndium - 20-10-2020 at 13:52

Recrystallization is always mesmerizing to watch.

https://vimeo.com/470354647

arkoma - 20-10-2020 at 14:12

My lab space represents!

IMG_20201020_170801_261.jpg - 406kB

Lion850 - 22-10-2020 at 20:19

Red crystals of what is supposed to be ammonium pentachloroferrate forming as the solution cools. Plan is to let the beaker cool slowly on the cooling hotplate overnight and to see whether I can recover dry crystals tomorrow. No idea if these are stable or hygroscopic. Will soon see!


136E9DFD-2A29-45CF-9B70-0975998BBA81.jpeg - 3.3MB

Herr Haber - 23-10-2020 at 20:38

Having uranium glass, fluorescein and a black light source I HAD to do it...

The decanter is full of fluorescein. So is the glass at the upper right corner. The one right below is empty.
The three other glasses were filled with drinks suited to the era this glass was made :)
From left to right: Absynth, Absynth with water, Chartreuse.
(Yes, I used to smoke cloves and listen to The Cure)

The second picture is the decanter and the shot of fluorescein.
Closer to the light source they just saturate the sensor

IMG_3301.JPG - 95kB IMG_3302.JPG - 49kB

[Edited on 24-10-2020 by Herr Haber]

j_sum1 - 23-10-2020 at 22:41

I bought some calcium years back. But I never had occasion to open the tin. However, with the tin showing signs of age and one of my students asking questions, I figured it was time for an unboxing. And to pop those babies under some oil.


IMG20201024162926.jpg - 2.9MB

Tsjerk - 24-10-2020 at 02:37

Herr Haber, nice pictures! Maybe you would find it interesting to see if you can show fluorescerent quenching. When the concentration of a fluorescerent molecule goes over a certain threshold, the fluorescence won't plateau, but actually go down because the dye will start to quench itself.

Herr Haber - 24-10-2020 at 08:42

Interesting idea.
I can see the difference between the glass and the dye but it's not as visible in the pictures. In the second one I diluted the original concentration to about 1/4th. That's what you see in the second picture but they are also closer to the light source.
I was thinking I would try to dilute more. I dont know much about optics but found interesting that my 1W blue laser would totally scatter. Not even a hint of blue on the other side of the decanter because of the dye.

Maybe I should try your suggestion in a beaker so the threshold is more visible when I make additions ?

Tsjerk - 24-10-2020 at 11:32

You could make a dilution series indeed and check when the fluorescence goes down with rising concentration. It shouldn't take a lot.

MidLifeChemist - 24-10-2020 at 14:21

Quote: Originally posted by j_sum1  
I bought some calcium years back. But I never had occasion to open the tin. However, with the tin showing signs of age and one of my students asking questions, I figured it was time for an unboxing. And to pop those babies under some oil.


nice! how much calcium is that?

j_sum1 - 24-10-2020 at 20:09

Quote: Originally posted by MidLifeChemist  
Quote: Originally posted by j_sum1  
I bought some calcium years back. But I never had occasion to open the tin. However, with the tin showing signs of age and one of my students asking questions, I figured it was time for an unboxing. And to pop those babies under some oil.


nice! how much calcium is that?

115 grams. It is pretty light stuff. And hard. Not sure what happens when I want a small piece.

j_sum1 - 24-10-2020 at 22:55

On a similar theme,
Lion850 arranged for me to score this little jar at a bargain price.
It is somewhat affected by air but a bit of hydrocarbon will prevent that from being an ongoing problem.
Standard size reference is given. There is also a lump of lead in there to keep it from floating.


2020-10-25 15.45.02b.jpg - 534kB

2020-10-25 15.45.28.jpg - 2.6MB

Lion850 - 25-10-2020 at 01:20

j_sum1 I like the "Standard size reference"; indeed universal hahaha.

I visited the supplier yesterday to get some thiourea; I meant to ask if he has more lithium but forgot.

mayko - 26-10-2020 at 16:02

handsome lil borax crystal

borax.jpg - 69kB

CharlieA - 26-10-2020 at 16:30

[rquote=647265&tid=26378
...I visited the supplier yesterday to get some thiourea... ...
[/rquote]

Out of curiosity, what would 10-50g of thiourea, shipped to the US, cost?

Lion850 - 26-10-2020 at 20:08

Hi CharlieA I paid Australian $30 for 500g thiourea (old stock). As far as I know the supplier I got this from does not ship overseas. Is thiourea hard to get in the US?

SEM images of dendrites

Bmoore55 - 26-10-2020 at 20:47

Some really pretty dendrites taken from a sample submitted to my lab.

8767BED2-CB89-4357-878E-3C372DEA42ED.jpeg - 289kB

Bedlasky - 27-10-2020 at 20:02

Quote: Originally posted by CharlieA  
[rquote=647265&tid=26378
...I visited the supplier yesterday to get some thiourea... ...
[/rquote]

Out of curiosity, what would 10-50g of thiourea, shipped to the US, cost?


If you have access to ammonium thiocyanate, you can make thiourea by thermal decomposition of NH4SCN.

For test tube complex chemistry can be also used solution for cleaning silver which often contains thiourea.

Lion850 - 27-10-2020 at 20:53

Something yellow-ish crystallising out of the red methanol solution as it slowly evaporates.

9D4F11B5-1713-4F7B-B104-DE3D007AB31F.jpeg - 2.5MB

Bedlasky - 27-10-2020 at 21:03

What compound is that?

Lion850 - 27-10-2020 at 21:49

Bedlasky it is an attempt to make nitratopentakis-tiokarbamatbismuth(III) nitrate [Bi(NO3)(CS(NH2)2)5](NO3)2. Thank heavens for copy and paste!

It is mentioned on the crystal growing wiki here:
https://en.m.crystalls.info/Nitratopentakis-tiokarbamatbismuth(III)_nitrate

While trying to find more details about this compound on the internet (I did not find exactly what I was looking for) I saw that some bismuth complexes are made using methanol as solvent. I then did two experiments (mixing thiourea and bismuth nitrate solutions), one using water and one using methanol. Water gave a red solution, this is slowly evaporating and so far staying red. Methanol gave a bright orange solution, which slowly became darker and more black as it was exposed to air, and now as it evaporates down in is becoming redder.

Lion850 - 8-11-2020 at 01:22

Potassium ferricyanide crystal, it is still growing.

9AB7762E-C074-4E09-AC20-BED67A66FF8B.jpeg - 2.6MB

j_sum1 - 14-11-2020 at 02:32



IMG20201114201856.jpg - 2.7MB


Probably a failure but really interesting nonetheless.
I am attempting to produce Zn powder by elecrolysis in alkaline medium.
Anode is a cast zinc sphere. Cathode is copper sheet now thickly coated in zinc (and not powdering off like I expected.)

The blue coating on the anode I presume is copper zincate. Not required but pretty.

MidLifeChemist - 14-11-2020 at 08:41

Quote: Originally posted by j_sum1  



The blue coating on the anode I presume is copper zincate. Not required but pretty.


It looks like a deep blue death star. Very interesting!

arkoma - 14-11-2020 at 13:37

With the exception of the piperine, these are shots of stuff that ends up "Where Beakers Go To Sit And Get Forgot About".


Piperine
IMG_20201114_151007_332.jpg - 327kB
Should be Lead Chloride. Had a beaker with a sat solution of Copper Chloride and chunks of lead in it on shelf for a month
IMG_20201114_151403_322.jpg - 344kB
The remnants of a 1940 something Mercury Dime in HNO3. Crystals of AgNO3 hard to see.
IMG_20201114_151243_124.jpg - 301kB
Mystery products from BenzylOH and Dichromate. Been sitting on shelf forever. Smells WoNDERFUL. Cherries.
IMG_20201114_151028_364.jpg - 349kB
A steel screw in a slotion of CuSO4. Grab bag of Cu powder and Iron Sulfate I reckon
IMG_20201114_151120_198.jpg - 362kB

Fyndium - 20-11-2020 at 10:53

I dug up my good old heating bath, and found that half of the liquor had crystallized into fancy formations. Did not know that calcium chloride can also look nice, as it's usually just caulky flakey gunk in big bags to be thrown on dirt roads.

bathpic.jpg - 234kB bathpic2.jpg - 221kB

Fluorite - 20-11-2020 at 13:02

Sodium zincate
NaOH and battery shell ugh I shouldn't touch it :(
cadmium blood test ASAP!

76949356_2174962066130897_3958102501189746688_o.jpg - 66kB

Bezaleel - 21-11-2020 at 16:33

Quote: Originally posted by Fluorite  
Sodium zincate
NaOH and battery shell ugh I shouldn't touch it :(
cadmium blood test ASAP!
:D

Enjoying the gorgeous red of bis-dimethylglyoximenickel(II), which appears to me like the colour of a raspberry-strawberry smoothie:

IMG_2923_adj_straight.JPG - 255kB

[Edited on 22-11-2020 by Bezaleel]

greenlight - 24-11-2020 at 07:55

Dirty old ice pack ammonium nitrate crystals.

[Edited on 24-11-2020 by greenlight]

Screenshot_20201124-235050_Gallery.jpg - 1.1MBScreenshot_20201124-235024_Gallery.jpg - 1.2MB

Piroz - 22-12-2020 at 15:52

Blue crystals are copper-calcium acetate (with white needles- that's calcium acetate). The orange liquid in smal bottles is dinitrogen tetraoxide/nitrogen dioxide.

Cu_Ca_Ac.jpg - 962kBCu_Ca_Ac2.jpg - 527kBNO2_N2O4.jpg - 668kB

egret - 25-12-2020 at 13:17

Steam distilled benzaldehyde.


_imgx.jpg - 237kB

paulll - 25-12-2020 at 17:57

Can't find a single tumbler in the place but luckily my hobby involves collecting glassware... Merry Christmas folks!

whisky.jpg - 52kB

Bedlasky - 26-12-2020 at 03:22

[MoOCl(H2O)4]+ solution in conc. HCl in volumetric flask. Concentration of Mo = 1,4 g/l.

IMG_20201226_105827.jpg - 2.1MB

Piroz - 3-1-2021 at 06:24

Sulfamic acid crystal

Sulfamic_acid.jpg - 1.1MB

roXefeller - 3-1-2021 at 11:14

Solved the daughter's shark puzzle with a python script I wrote, called sharks_on_a_plane.py

SharksOnAPlane.jpg - 119kB

j_sum1 - 5-1-2021 at 04:08

Winner of the thread!

This has been posted before in this thread: but so worth repeating.
https://labphoto.tumblr.com/tagged/portfolio

Credit to Kristof Hegadus, kristofvagyok
I doubt he is still active here and the tumblr is five years since last post.
But it is a gem that is not worth letting slide into the dark chasms of the internet.

stibium - 18-1-2021 at 06:10

Phosphorescent materials based on alkaline earth sulfides and zinc sulfide

From left to right:
SrS:Eu
CaS:Eu,Ce,Tm
SrS:Bi
CaS:Bi,Ag
ZnS:Cu

I explain how I made them at the thread "making phosphorescent materials"


Sulfides 1.jpg - 2.5MB Sulfides 2.jpg - 1.7MB Sulfides 3.jpg - 2.3MB

greenlight - 18-1-2021 at 19:55

Quote: Originally posted by stibium  
Phosphorescent materials based on alkaline earth sulfides and zinc sulfide

From left to right:
SrS:Eu
CaS:Eu,Ce,Tm
SrS:Bi
CaS:Bi,Ag
ZnS:Cu

I explain how I made them at the thread "making phosphorescent materials"




Beautiful!

Very nice

Sulaiman - 18-1-2021 at 21:37

:cool::cool::cool:

j_sum1 - 18-1-2021 at 22:57

Ok. I am indpired. I am going to have tobread that procedure.

woelen - 19-1-2021 at 00:30

That looks really nice. I have the ZnS:Cu variation, but I did not know of the other beautifully colored phosphorescences. Maybe I should try some of these as well.

Piroz - 19-1-2021 at 14:14

Thanks to my stupidity nature created this.
I left glass with water outside for a moment (it was minus 12 degrees C) and a dozen hours later got back. Just forgot. However the glass didn't break.

FrozenGlass.jpg - 967kB

[Edited on 20-1-2021 by Piroz]

arkoma - 20-1-2021 at 01:44

Quote: Originally posted by j_sum1  
Ok. I am indpired. I am going to have tobread that procedure.


Were you necking a few tinnies^^? And thanx for posting the link to Kristof's blog. Guess I'm getting to be an "old timer" here as things slip my mind now.

Lion850 - 4-2-2021 at 01:27

I hope it is allowed to post a video in this thread. See attached showing gallium attacking iodine. Really surprised me.

Attachment: trim.C5772431-201F-4FD0-858B-A45812C38C88.MOV (6.2MB)
This file has been downloaded 214 times

woelen - 5-2-2021 at 03:50

Very nice observation! Probably the combined volume of gallium + the volume of consumed solution of iodine has a slightly larger volume than the produced solution of gallium iodide, leading to slight underpressure at the place where the gallium 'eats' the iodine, leading to the attack-like behavior.

Piroz - 14-2-2021 at 12:43

Manganese sulfate crystal.

MnSO4_2.jpg - 752kB MnSO4_1.jpg - 455kB

[Edited on 14-2-2021 by Piroz]

Lion850 - 14-2-2021 at 16:37

Piroz the crystal looks beautiful.

Lion850 - 15-2-2021 at 00:10

Orange tin iodide (I assume) forming around the tin granules.

0834D1F4-836E-4A7F-A9B2-7476C5BC460C.jpeg - 1.1MB

Sulaiman - 15-2-2021 at 01:16

Quote: Originally posted by Piroz  
Manganese sulfate crystal.
Beautiful !

How long did it take to grow ?

Piroz - 15-2-2021 at 02:28

Quote: Originally posted by Sulaiman  

How long did it take to grow ?

2 or 3 weeks.

Lion850 - 19-2-2021 at 14:06

Tin iodide crystals continue to grow. I’m not sure there is much I2 or HI left but I’ll leave it a few more days. Then to figure out how to wash them to remove residual acid. Any ideas?

Edit: The 'mounds' in the photo was the shape the crystals made as they grew from the tin granules - all the tin seems consumed now (the mounds are hollow) and there is no acid smell at all. Tomorrow I'll dry it on the steam bath and see what happens.

D5561EA2-0930-48F3-8B28-43DFFFC4E526.jpeg - 1.4MB 004DC0B3-968A-4065-89D3-D1A12BE9BFC1.jpeg - 2.2MB

[Edited on 20-2-2021 by Lion850]

arkoma - 28-2-2021 at 10:57



furnace temp.png - 272kB

Homemade furnace temp..................

itsallgoodjames - 11-3-2021 at 08:37

So I left a saturated solution of copper sulfate in a beaker for a few days with a watch glass over the top, and came back to this at the bottom of the beaker. Nice looking mistake I guess

20210309_174206.jpg - 1.9MB

Bezaleel - 25-3-2021 at 14:35

Quote: Originally posted by Piroz  
Manganese sulfate crystal.
[Edited on 14-2-2021 by Piroz]

Looks great! The right side looks as if the crystal is hexagonal. That's a bit odd, as its crystal structure is monoclinic (I assume you have the tetrahydrate).

Is it stable in air, or do the surfaces dull over time?

Bezaleel - 25-3-2021 at 14:38

Quote: Originally posted by Lion850  
Tin iodide crystals continue to grow. I’m not sure there is much I2 or HI left but I’ll leave it a few more days. Then to figure out how to wash them to remove residual acid. Any ideas?

Edit: The 'mounds' in the photo was the shape the crystals made as they grew from the tin granules - all the tin seems consumed now (the mounds are hollow) and there is no acid smell at all. Tomorrow I'll dry it on the steam bath and see what happens.[Edited on 20-2-2021 by Lion850]

Well, what happened when you dried them?

Also, I guess that when you recrystallise them from water, they may yield larger crystals.

Lion850 - 25-3-2021 at 22:27

Hi Bezaleel the full report is here

http://www.sciencemadness.org/talk/viewthread.php?tid=156987...


Lion850 - 29-3-2021 at 16:16

My wife needed a new vase....the Great Dane approved :)



6961D07F-106A-4ABD-8359-985864BDF788.jpeg - 2.6MB

j_sum1 - 29-3-2021 at 18:31

She is not approving the vase. She is sitting by the fridge wondering when her next chicken is arriving.

B(a)P - 30-3-2021 at 00:41

Quote: Originally posted by Lion850  
My wife needed a new vase....the Great Dane approved :)





Over fill protection and everything!

arkoma - 31-3-2021 at 23:02

azeotropin HNO3[/

2021-04-01-020048.jpg - 57kB

Who woulda thought I'd stumble in to a practically bottomless HNO3 bottle? Five gallons sulfuric (92%) and ten pounds nitrate......

been drinking coffee and running 100gm batches all night!

[Edited on 4-1-2021 by arkoma]

[Edited on 4-1-2021 by arkoma]

j_sum1 - 18-6-2021 at 03:26

20 ampoules of cobalt chloride solutoin ready to be sent out to my students for equilibrium exeriments (adjusting temperature in a closed system).


IMG20210618211811[1].jpg - 2.8MB

Lion850 - 2-7-2021 at 19:18

Wet remainder that should be a cobalt glutamate compound (I think).

913FEDEE-8E92-4010-9FC0-2AF336B836BC.jpeg - 1.3MB

Lion850 - 3-7-2021 at 19:51

A chocolate coloured compound :)

2A1F4D14-FABE-408A-9FA9-26443F455882.jpeg - 2.1MB

j_sum1 - 3-7-2021 at 21:52

I dried out some molecular sieves and then poured them in a flask. These dusty trails were left on the side of my evaporating dish.

IMG20210704154913.jpg - 4.1MB

arkoma - 10-7-2021 at 19:17

Nitric Acid!

IMG_20210710_214710892_HDR.jpg - 645kB

A little while further in I'm getting this lovely clear azeotrope.



IMG_20210710_231838491.jpg - 305kB

*edit* added update

[Edited on 7-11-2021 by arkoma]

Lion850 - 23-7-2021 at 18:45

Ketchup?


No….wet chromium picolinate :)

B5118AA7-11C1-499A-8C9C-FFAF5E9F93F7.jpeg - 858kB

CaCl2 - 1-9-2021 at 10:57

Some pictures of my attempts at making YInMn blue.


The first attempt ended up reddish brown, don't know if it was the materials I used or something else. (Made the yttrium oxide from an ebay element sample, didn't convert the manganse dioxide to manganese(III) oxide first.)

On my second attempt I first got a gray material covered with a thin bright yellow layer. After re-grinding it and heating it more (this time without it being covered so it got lots of air.), when I took it out of the furnace it looked completely black at first but as it cooled it finally gained a nice blue color.

I had almost lost hope of ever achieving blue at that point.



Red.jpg - 500kB Yellow.jpg - 596kB Blue.jpg - 619kB

infrablue - 2-9-2021 at 16:13

CuSO4 reacting with KCl in aqueous solution.

20210902_164800_HDR.jpg - 293kB

infrablue - 2-9-2021 at 16:33

Quote: Originally posted by CaCl2  
On my second attempt I first got a gray material covered with a thin bright yellow layer. After re-grinding it and heating it more (this time without it being covered so it got lots of air.), when I took it out of the furnace it looked completely black at first but as it cooled it finally gained a nice blue color.

It looks great! The color is well saturated.

[Edited on 2021-9-3 by infrablue]

Lion850 - 2-9-2021 at 20:18

The interesting color difference between cobalt and nickel nicotinate tetrahydrates vs the anhydrous salts

07B1650B-614B-41C2-B254-78666AE67BD8.jpeg - 2.7MB

Bedlasky - 19-10-2021 at 20:18

My girlfriend gave me empty bottles which are perfect for making alcohol burners :D. Left is H3BO3 in EtOH, right is LiCl in EtOH (in reality it looks more red, on the photo it looks like calcium flame :().

Just short question - does H3BO3/EtOH burner create significant amount of ester? I just wondering if I doesn't create some B2O3 aerosol in the room.

DSC03959.JPG - 5.7MB

Very colorful picric acid synthesis from salicylic acid

itsallgoodjames - 21-10-2021 at 07:23



20210928_180714.jpg - 2.1MB

20210928_173404.jpg - 2.7MB

20210929_070741.jpg - 3.2MB

Very colorful picric acid synthesis from salicylic acid. It went from colorless to vibrant red to orange (the pictures aren't in order), then when it was added to cold water went the expected picric acid yellow. The last image is the recrystallization of it

Sulaiman - 21-10-2021 at 11:15

Quote: Originally posted by Bedlasky  
My girlfriend gave me empty bottles which are perfect for making alcohol burners
methanol with a nice wick gives an almost invisible flame,
unlike ethanol which has a yellow tint that makes the desired colours less intense.
its a big difference.

Bedlasky - 24-10-2021 at 10:01

I also tried methanol later. This time I replaced LiCl with CuCl2. And yes, flame has much better colour.

Morgan - 24-10-2021 at 17:00

Quote: Originally posted by Bedlasky  
I also tried methanol later. This time I replaced LiCl with CuCl2. And yes, flame has much better colour.


Yea, LiCl makes a pleasing red with methanol as seen here briefly in this bottle I used.
https://youtu.be/OUsha3uFPAA

Bedlasky - 24-10-2021 at 17:57

Yeah, I really love that red lithium flame. Everytime I read something about coloured flames or pyrotechnics, everyone always use strontium for red flames, but lithium make more intense, richer red flame (and also that particular shade of red look nicer than strontium red).

[Edited on 25-10-2021 by Bedlasky]

DraconicAcid - 3-11-2021 at 17:04



CuSO4xls.jpeg - 540kB

DraconicAcid - 3-11-2021 at 17:06

Hydrated manganese(II) sulphate

MnSO4xls.jpeg - 1024kB

karolus28 - 22-11-2021 at 12:57

potassium chlorate crystal

IMG_9272.JPG - 3.4MB

Fery - 22-11-2021 at 22:30

Quote: Originally posted by Bedlasky  
alcohol burners... left is H3BO3 in EtOH... does H3BO3/EtOH burner create significant amount of ester?

IIRC H3BO3 is used as a quick test to distinguish methanol from ethanol, with methanol the flame is green, but it does not color significantly ethanol
you should not rely on such test too much, e.g. if the result is negative (no green flame) you are still not safe to drink such alcohol... I'm writing this because we all here are of course chemists but some alcohol drinker(s) may visit this forum while looking for the information how to distinguish these 2 alcohols
I wonder why the esterification proceeds with methanol and not with ethanol, whether it is because of kinetics/polarity/solubility or because common ethanol usually contains water (most of available ethanol is azeotrope, anhydrous ethanol is very rare). If the reason is the second case then adding something like 5% water into methanol should prevent green color of the flame while using anhydrous ethanol should color the flame to green.

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