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Author: Subject: Pretty Pictures (2)
Mailinmypocket
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[*] posted on 21-1-2014 at 08:56


The extraction was done a few months ago so I'll have to check my notes and get back to you. It was basically just precipitating the gold out of aqua regia with sodium metabisulfate which gave gold powder. Then the powder was melted down with two MAPP gas torches. I'm sure the gold is quite pure just based on the composition of 14k gold... Nothing else should have precipitated out.
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kristofvagyok
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[*] posted on 21-1-2014 at 09:57







That awesome moment when a reaction overreacts. It climbs out from the flask, directly to the wall of the fume hood.

The sad part: it was a concentrated sodium methoxide solution what will be great to clean up. Organic chemistry <3




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Zyklon-A
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[*] posted on 21-1-2014 at 11:50


Strontium nitrate/potassium perchlorate, and aluminum flash powder:

PICT0037.JPG - 99kB

Intentionally slow burning, (so I could get it on camera).

[Edited on 21-1-2014 by Zyklonb]




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Bot0nist
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[*] posted on 21-1-2014 at 12:52


kristofvagyok, I love that pic of you flicking off that horrible mess. It shows the (sometimes) shitty side of chemistry.



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Magpie
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[*] posted on 21-1-2014 at 13:25


Quote: Originally posted by Bot0nist  
It shows the (sometimes) shitty side of chemistry.


Yes, I think we've all been there.

Kristo could you tell us the nature of the reaction, and the scale?




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kristofvagyok
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[*] posted on 21-1-2014 at 13:37


Quote: Originally posted by Magpie  

Kristof could you tell us the nature of the reaction, and the scale?

It was an intermediate during the synthesis of cubane, according to this, the third step:


The scale was a circa 400g.


A picture from the bromination:


[Edited on 21-1-2014 by kristofvagyok]




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DraconicAcid
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[*] posted on 21-1-2014 at 13:42


And I suppose it was the final step. My sympathies.



Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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Zyklon-A
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[*] posted on 22-1-2014 at 06:15


Quote: Originally posted by Bot0nist  
kristofvagyok, I love that pic of you flicking off that horrible mess. It shows the (sometimes) shitty side of chemistry.


Although I have heard it both ways, I think the correct verb, to give the finger, is flipping off, not flicking off.

Some people say that you flip off a person, and you flick off a thing. E.g. mess. I don't know if that's true though.




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ElizabethGreene
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[*] posted on 22-1-2014 at 13:00


Quote: Originally posted by Hegi  
Quote: Originally posted by bfesser  
Maybe not pretty, but I like the look of this dial and tube:


I don´t even know what is the first device used for.. o.O looks pretty! ;)


The CD V-715 is an Ion chamber gamma ray detector used to detect (large) amounts of radiation subsequent to a nuclear war. It was manufactured and distributed through the US Civil Defense program in the 1960s. The "little brother" of this device is a Geiger counter. Those are built around the geiger-muller tube in the second picture. The two devices work on different mechanisms to do the same job.

The range of this detector is measured in roentgens per hour. The normal radiation dose for a person is measured in hundreds of milli-roentgens per year.
Terrifyingly, there were 0-50 R/hr and 0-500 R/hr meters too. I'd rather not ever see that needle move off zero, thanks.

Bfesser: That meter is in fantastic shape. Did you restore it?

<!-- bfesser_edit_tag -->[<a href="u2u.php?action=send&username=bfesser">bfesser</a>: removed quoted images]

[Edited on 24.1.14 by bfesser]
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Brain&Force
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[*] posted on 22-1-2014 at 15:00


Here's some tetraamminecopper(II) sulfate and tetrachlorocupric acid (is that what you'd call the green product formed by HCl + CuCl2?).

copper complexes.png - 966kB

A cool demonstration to do is to heat a vial with iodine until it vaporizes. Cap the vial (being careful not to burn yourself in the process) and invert it. The result is an iodine cap over the vial, like this (it didn't form completely, and the photo's a little blurry):

iodine cap.png - 632kB




At the end of the day, simulating atoms doesn't beat working with the real things...
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bfesser
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[*] posted on 22-1-2014 at 15:24


Quote: Originally posted by ElizabethGreene  
I'd rather not ever see that needle move off zero, thanks.

Bfesser: That meter is in fantastic shape. Did you restore it?
Surprisingly, no. It was in this condition when I purchased it from the surplus shop. The only problem I found was that the ferrite core of an inductor had broken loose and was sliding freely back-and-forth through the bobbin, when tilted. I 'fixed' this with a small piece of clear Scotch tape over each end. With a D cell installed, the circuit check and zero work as expected; as far as I can tell, it's in perfect working order&mdash;I don't have a &gamma; source strong enough to deflect the needle.

ferrite_core.png - 522kB scotch_tape.png - 614kB <a href="http://www.flickr.com/photos/35937732@N02/11920075066/" title="CD V-742 by bfesser, on Flickr" target="_blank"><img src="http://farm4.staticflickr.com/3832/11920075066_be60878034_n.jpg" width="200" height="150" alt="CD V-742"></a> <img src="../scipics/_ext.png" valign="top" />

As for the range, let's just say that I'd rather not have need to use this meter, nor would I like to see deflection in the filaments of my 200 Röntgen dosimeters.

[Edited on 30.1.14 by bfesser]




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zenosx
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[*] posted on 23-1-2014 at 21:15


Tis pretty, but I would hope to NEVER see than needle move in my presence :)

Quote: Originally posted by bfesser  
Maybe not pretty, but I like the look of this dial and tube:


<!-- bfesser_edit_tag -->[<a href="u2u.php?action=send&username=bfesser">bfesser</a>: removed quoted images]

[Edited on 24.1.14 by bfesser]




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Mailinmypocket
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[*] posted on 26-1-2014 at 11:26


Distilling bromine, always beautiful :) This was to produce ~100ml.
[img][/img]
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Brain&Force
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[*] posted on 26-1-2014 at 14:19


Some astronomy: the moon, Saturn and Jupiter



Moon.png - 1MBSaturn.png - 38kBBest Jupiter photo ever.png - 280kB




At the end of the day, simulating atoms doesn't beat working with the real things...
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alexleyenda
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[*] posted on 29-1-2014 at 17:35


Failed attempt to make a prince rupert's drop, beautiful anyway.


photo (6).JPG - 155kB
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Zyklon-A
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[*] posted on 29-1-2014 at 17:53


How did it fail? The air bubbles inside? Looks awesome to me! I've always thought molten glass would shatter if dropped into RT water.



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[*] posted on 29-1-2014 at 18:08


I don't know why it failed, all I know is that it did, when I crushed the tail the drop did not shatter. Second try : No bubble, a part of the bottom of the drop shattered in the water. I'm done for today, it takes so long before the drop starts falling.

[Edited on 30-1-2014 by alexleyenda]
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zenosx
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[*] posted on 30-1-2014 at 18:27
New pics


First are a CD pen type exposure counter after being reset and stored with my Uranium collection for about a year. There is also 1 uCi of Americium there, but being a Y only emitter, it doesn't count. Total U ore = about 1 lbs.

While it took over a year, I certainly wouldn't want to sleep with that under my pillow. 20 R exposure would certainly cause quite a bit of DNA damage :P

Last photo is an extract of ~ 70 mL artificial vanilla which listed ethyl vanillin as the vanilla ingredient. Extracted with DCM.
The two spots look suspiciously like bacterial contamination.

Roentgens Exposure.JPG - 50kB Roentgens Exposure 2.JPG - 88kB Ethyl Vanillin .JPG - 127kB




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Brain&Force
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[*] posted on 31-1-2014 at 20:03


Beautiful flame of copper chloride/methanol. Interestingly, copper chloride is reduced in the flame to the metal. The second photo is of the sulfate/methanol mix. It doesn't dissolve well (sulfates don't dissolve in alcohols). The chloride flame is ethereal and has a bluish tint that the sulfate flame does not have.
The third photo is terbium sulfate filtrate under shortwave UV light.

cu chloride flame.jpg - 359kBcu sulfate flame.jpg - 212kBtb sulfate filter paper.jpg - 443kB




At the end of the day, simulating atoms doesn't beat working with the real things...
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[*] posted on 3-2-2014 at 08:06


Steam-distilling crude chlorobenzene out of Sandmeyer reaction waste.

DSCN0267-2.jpg - 157kB




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Zyklon-A
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[*] posted on 3-2-2014 at 08:32


Hey, that's a good idea, to put weights on your chemistry stand, I'm going to do that next time I'm holding something heavy on it.



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[*] posted on 3-2-2014 at 18:21


I was thinking the same thing when I saw that....



A question that sometimes drives me hazy: am I or are the others crazy?

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Zyklon-A
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[*] posted on 3-2-2014 at 19:45


Precipitating copper carbonate, looks way better in real life.

PICT0057 - Copy.png - 178kB




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[*] posted on 3-2-2014 at 21:22


How could you live without weights on your stands :p The first thing I did when I received mine is to put weights on them, they are so unstable without them.

@ Zyklonb, it looks great, I always loved copper solutions/compounds, the colours are so vibrant.

Anyways, here's my collection of canadian dollars vandalized through electroplating/heating/chemical plating :D. It was a lot of fun/learning/challenge/frustration through many months, it is not really hard but I started doing this 5 months ago when I just started chemistry as a hobby and I also had to wait to get more chemicals and labware to make different platings. The next one will be silver when I'll finaly manage to get HNO3 to dissolve it, Nitrates are so hard to get in Canada!

The one on the left (normal) should be bronze according to wikipedia. The mg's color is strange, it's the first one I made back at the time, I guess I did something wrong !





piasse.bmp - 420kB



[Edited on 4-2-2014 by alexleyenda]
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[*] posted on 3-2-2014 at 21:29


What was the process for plating Mg? If you did it in water, the metal would not reduce - it would convert to the hydroxide instead because the water already releases enough protons to reduce the metal. You'd need an anhydrous solvent like THF or pyridine.



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