borontrichloride
Harmless
Posts: 23
Registered: 8-7-2017
Member Is Offline
Mood: No Mood
|
|
Crystallisation Question
To crystallise a complex, instead of heating it and bringing it back down to room temperature, has anybody tried simply putting it in the fridge? The
lower temperature may work in the same way?
|
|
|
nezza
Hazard to Others
Posts: 324
Registered: 17-4-2011
Location: UK
Member Is Offline
Mood: phosphorescent
|
|
The idea of crystallisation to purify materials is to get the most product out of the solution. While taking a room temperature saturated solution and
cooling it in the fridge may well give you some crystals you will get a much greater yield from a hot saturated solution which in any case for
crystallising to purify materials I would put in the fridge anyway to maximise product yield. If you are crystallising to produce large crystals for
display you need to allow them to grow very slowly, usually by allowing the solution to concentrate by evaporation at room temperature.
If you're not part of the solution, you're part of the precipitate.
|
|
|
borontrichloride
Harmless
Posts: 23
Registered: 8-7-2017
Member Is Offline
Mood: No Mood
|
|
So I could theoretically pour out my solutions onto a large, wide glass plate and allow the solvent to slowly evaporate - as this happens, crystals
will form?
|
|
|
JJay
International Hazard
Posts: 3440
Registered: 15-10-2015
Member Is Offline
|
|
I tried that recently (in a large beaker, actually), and it seems to make nice crystals.
Nile Red grew some huge crystals of lead acetate in this video: https://www.youtube.com/watch?v=lOjLuJyMmUQ
|
|
|
borontrichloride
Harmless
Posts: 23
Registered: 8-7-2017
Member Is Offline
Mood: No Mood
|
|
Thank for that. Any method I can find, that doesn't require heating transition metal solutions in the kitchen, I am down for!
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
