Sciencemadness Discussion Board
Not logged in [Login ]
Go To Bottom

Printable Version  
Author: Subject: How to stir solution with iron filings on a hot plate stirer?
Lion850
National Hazard
****




Posts: 296
Registered: 7-10-2019
Location: Australia
Member Is Offline

Mood: Great

[*] posted on 22-12-2019 at 23:22
How to stir solution with iron filings on a hot plate stirer?


I need to stir a beaker with iron filings and iodine in water on my hot plate stirrer. Using a standard PTFE coated stir bar results in all the iron filings sticking to the bar. I though the iron filings would move around on their own (without any stir bar being thrown into the beaker) when the stirrer is turned on but they do not. My question is how can I get the iron filings moving around (other than boiling)? This reaction can take hours so manually stirring is not an option.
View user's profile View All Posts By User
j_sum1
Administrator
********




Posts: 5292
Registered: 4-10-2014
Location: Oz
Member Is Offline

Mood: Metastable, and that's good enough.

[*] posted on 22-12-2019 at 23:37


I recall (early) nurdrage usung a paperclip once but I think the paperclip was the reagent.

Stirring from the top would seem to be the most logical option but if you are committed to magnetic stirring you might experiment with different stirrer geometries. One of those cross-shaped ones with large paddling action might work.


Or, here's an idea: no idea if it would work. Mould your iron filings into pellets using something that will eventually dissolve or disintegrate. Maybe even fashion them into a stir bar and magnetise it.

Perhaps more practically, see if you can devise a way to stir by bubbling an inert gas or air if it is appropriate.


If I am following your work correctly, you are aiming for iron III iodide. Good luck.
View user's profile View All Posts By User
Lion850
National Hazard
****




Posts: 296
Registered: 7-10-2019
Location: Australia
Member Is Offline

Mood: Great

[*] posted on 23-12-2019 at 00:49


Hi j_sum1 thanks for the suggestions. I actually just finished in the shed and it seems the filings reacted OK with the iodine even though they were stuck to the stir bar. But I still would prefer them swirling around in the solution :)

I think I made Iron (ii) iodide FeI2? I'll post a report in the usual forum and hopefully some member more knowledgeable will comment.
View user's profile View All Posts By User
Mush
International Hazard
*****




Posts: 529
Registered: 27-12-2008
Member Is Offline

Mood: No Mood

[*] posted on 23-12-2019 at 04:47


With a help of an overhead stirrer.
View user's profile View All Posts By User
PirateDocBrown
National Hazard
****




Posts: 496
Registered: 27-11-2016
Location: Minnesota
Member Is Offline

Mood: No Mood

[*] posted on 23-12-2019 at 11:25


A couple ball bearings?



Phlogiston manufacturer/supplier.

For all your phlogiston needs.
View user's profile View All Posts By User
SWIM
International Hazard
*****




Posts: 708
Registered: 3-9-2017
Location: 26 Ancho street
Member Is Offline

Mood: fractious

[*] posted on 25-12-2019 at 18:57


Wait a minute...
If the stirbar is rotating and they're stuck to the stirbar they are moving.

They may be stuck to the bar, but they're being dragged through the solution forcing new material into contact with it while the rest of the solvent is being stirred.

Are you sure that's not sufficient?

This isn't a rhetorical question. I really don't know if these two situations are all that different or not.





Ebay says they need to get their hands on my bank account if I want to keep selling there.
This sounds like the best idea since putting ortho tricresyl phosphate in Ginger Jake.
I'm walking while I can still walk straight.




View user's profile View All Posts By User
Lion850
National Hazard
****




Posts: 296
Registered: 7-10-2019
Location: Australia
Member Is Offline

Mood: Great

[*] posted on 25-12-2019 at 21:53


Hi SWIM the reaction did in fact proceed so I think as you say although stuck they still move through the solution. I initially thought there was a lot of iron left over, that did not react, but in fact I got a reasonable volume of product so it certainly worked to some extent.

AS mentioned by a few users stirring from above is also an option.
View user's profile View All Posts By User

  Go To Top