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Author: Subject: The Short Questions Thread (4)
CharlieA
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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?
B(a)P
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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?
clearly_not_atara
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 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]
paulll
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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.
karlos³
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 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!

But seriously, like that?
Because initially I imagined a clamp to hold the receiving flask connected with the vacuum adapter(or cow) or such.
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!
paulll
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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

[Edited on 14-9-2020 by paulll]
Morgan
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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
Antigua
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 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

Here - I found them through a simple search, but they do look very expensive.

[Edited on 29-9-2020 by Antigua]
Morgan
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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

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.
Just now found it.
Morgan
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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

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.
Just now found it.

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.

[Edited on 2-10-2020 by Morgan]
j_sum1

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Anyone able to give any enlightenment as to what this reaction is?

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?
DraconicAcid
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 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?

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

I think this is what you are after.

j_sum1

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 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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 Sciencemadness Discussion Board » Fundamentals » Miscellaneous » The Short Questions Thread (4) Select A Forum Fundamentals   » Chemistry in General   » Organic Chemistry   » Reagents and Apparatus Acquisition   » Beginnings   » Responsible Practices   » Miscellaneous   » The Wiki Special topics   » Technochemistry   » Energetic Materials   » Biochemistry   » Radiochemistry   » Computational Models and Techniques   » Prepublication Non-chemistry   » Forum Matters   » Legal and Societal Issues   » Detritus   » Test Forum