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Author: Subject: The Short Questions Thread (4)
CharlieA
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[*] posted on 9-9-2020 at 17:03


Just a WAG (as opposed to a SWAG): could this be some kind of device to deliver 10 mL of a reagent from some kind of reservoir?
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B(a)P
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[*] posted on 11-9-2020 at 02:34


Some time ago I purchased a cheap condenser and it came with an addition funnel. I used the addition funnel for the first time today and it was almost impossible to get a constant drip rate. Can I replace the tap to get something usable, any tips for getting crappy taps to perform or do I just forget it?
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clearly_not_atara
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[*] posted on 11-9-2020 at 04:39


Quote: Originally posted by S.C. Wack  
The only time anyone does it (edit: should do it) cold is when they are trying to do it without glassware.

For the reaction this is true, but in order to achieve the best phase separation at workup you want the solution to be just barely above freezing IIRC




[Edited on 04-20-1969 by clearly_not_atara]
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paulll
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[*] posted on 12-9-2020 at 19:53


Has anybody ever heard of such a thing as a spring-loaded flask clamp? With how handy it would be for receiving flasks it seems to be a thing that should exist and yet I don't see any anywhere.
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karlos┬│
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[*] posted on 12-9-2020 at 22:42


Quote: Originally posted by paulll  
Has anybody ever heard of such a thing as a spring-loaded flask clamp? With how handy it would be for receiving flasks it seems to be a thing that should exist and yet I don't see any anywhere.

Could you draw one, just a bad sketch to get the idea?
I'm not sure how that should look like.

I hope not like that: https://www.sigmaaldrich.com/content/dam/sigma-aldrich/produ...
Because that would mean they stole and produced your idea, and that in merely hours!
Those capitalist pigs, no respect on your intellectual property! :o

But seriously, like that?
Because initially I imagined a clamp to hold the receiving flask connected with the vacuum adapter(or cow) or such.
Just a plain flask clamp.
Only that I can't picture how such a thing would look like spring-loaded, which is why I was asking for a sketch of it.
And promised, not to steal the idea and sell it to sigma or whoever bids most, you have my hobby chemist word of honor on that! :D
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paulll
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[*] posted on 13-9-2020 at 18:26


Notwithstanding the fact that I can't draw with or without a computer... something like this. I'm thinking, e.g., for the receiving flask in a distillation rig - or any other flask that you'd want to change out mid-experiment.
So instead of tightening a thumbscrew to apply pressure to the piece, you'd be unscrewing it to release spring tension onto it, to hold it in place. The flask could then be removed and replaced by squeezing the other end of the clamp scissors-style. If that makes sense lol


Untitled 1.png - 12kB

[Edited on 14-9-2020 by paulll]
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Morgan
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[*] posted on 29-9-2020 at 07:54


Does anyone know a company that makes these cylindrical volumetric flasks?

https://i.ebayimg.com/images/g/QqkAAOSwg35atCrz/s-l1600.jpg
https://i.ebayimg.com/images/g/GLsAAOSwuHZatCr0/s-l1600.jpg
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Antigua
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[*] posted on 29-9-2020 at 08:02


Quote: Originally posted by Morgan  
Does anyone know a company that makes these cylindrical volumetric flasks?

https://i.ebayimg.com/images/g/QqkAAOSwg35atCrz/s-l1600.jpg
https://i.ebayimg.com/images/g/GLsAAOSwuHZatCr0/s-l1600.jpg

https://www.wilmad-labglass.com/
Here - I found them through a simple search, but they do look very expensive.

[Edited on 29-9-2020 by Antigua]
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Morgan
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[*] posted on 29-9-2020 at 15:22


Quote: Originally posted by Antigua  
Quote: Originally posted by Morgan  
Does anyone know a company that makes these cylindrical volumetric flasks?

https://i.ebayimg.com/images/g/QqkAAOSwg35atCrz/s-l1600.jpg
https://i.ebayimg.com/images/g/GLsAAOSwuHZatCr0/s-l1600.jpg

https://www.wilmad-labglass.com/
Here - I found them through a simple search, but they do look very expensive.

[Edited on 29-9-2020 by Antigua]


I see some cylindrical volumetric flasks there but not the identical shape. There are also square volumetric flasks I found that are close to it in proportion such as this one.
https://www.gogenlab.com/lab-supplies/flasks/volumetric-flas...
Just now found it.
https://kinesis.co.uk/dissolution-900ml-volumetric-flask-wit...
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Morgan
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[*] posted on 2-10-2020 at 07:01


Quote: Originally posted by Morgan  
Quote: Originally posted by Antigua  
Quote: Originally posted by Morgan  
Does anyone know a company that makes these cylindrical volumetric flasks?

https://i.ebayimg.com/images/g/QqkAAOSwg35atCrz/s-l1600.jpg
https://i.ebayimg.com/images/g/GLsAAOSwuHZatCr0/s-l1600.jpg

https://www.wilmad-labglass.com/
Here - I found them through a simple search, but they do look very expensive.

[Edited on 29-9-2020 by Antigua]


I see some cylindrical volumetric flasks there but not the identical shape. There are also square volumetric flasks I found that are close to it in proportion such as this one.
https://www.gogenlab.com/lab-supplies/flasks/volumetric-flas...
Just now found it.
https://kinesis.co.uk/dissolution-900ml-volumetric-flask-wit...


I noticed this 2 liter size is listed for $210.89 and probably shipping costs. I decided to buy that shape having found 4 of them (same Kimble 28040 flask) for sale for $34.25 each or best offer on eBay, new old stock so I bought one along with free shipping. The square flask is 5 X 5 X 18 inches.
https://www.gogenlab.com/lab-supplies/flasks/volumetric-flas...

[Edited on 2-10-2020 by Morgan]
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j_sum1
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[*] posted on 18-10-2020 at 16:56


Anyone able to give any enlightenment as to what this reaction is?
https://www.youtube.com/watch?v=cVxySCgUy8A

I thought it was a stunning demo and one I would love to add to my repertoire.
CoCl2 I have. But what is the reaction mixture being used? And what kind of complexing causes the green?
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DraconicAcid
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[*] posted on 18-10-2020 at 17:19


Quote: Originally posted by j_sum1  
Anyone able to give any enlightenment as to what this reaction is?
https://www.youtube.com/watch?v=cVxySCgUy8A

I thought it was a stunning demo and one I would love to add to my repertoire.
CoCl2 I have. But what is the reaction mixture being used? And what kind of complexing causes the green?


Might be basic peroxide and carbonate? Or basic peroxide and oxalate?




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Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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B(a)P
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[*] posted on 18-10-2020 at 19:02


https://uwaterloo.ca/chem13-news-magazine/march-2014/activities/sharing-chemistry-community-colorful-catalyst

I think this is what you are after.

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j_sum1
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[*] posted on 18-10-2020 at 19:23


Quote: Originally posted by B(a)P  
https://uwaterloo.ca/chem13-news-magazine/march-2014/activities/sharing-chemistry-community-colorful-catalyst

I think this is what you are after.


Awesome. that is just great!
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