chemic_oll
Harmless
Posts: 7
Registered: 16-4-2015
Member Is Offline
Mood: No Mood
|
|
Using a sintered buchner funnel
Hi.
This may well be a rather daft question but......
When using a sinterd buchner funnel how does one go about cleaning the filtrate from the sintered pad? Is it just a case of scraping it out with a
spatula etc? I've only ever used porcelain funnels with filter paper where it is easy to remove the filter and recover even the smallest amount of
filtrate.
In my head I just imagine filtrate staying stuck in the pad?
Am I just being foolish?
Also how would one decide what porosity to choose when purchasing a sintered funnel?
|
|
|
Texium
Administrator
Posts: 4581
Registered: 11-1-2014
Location: Salt Lake City
Member Is Offline
Mood: PhD candidate!
|
|
Yeah, sintered funnels are just usually pretty hard to clean. I think that the finer ones are easiest to clean since the plates are more smooth and
stuff doesn't get stuck in them as well. The more coarse ones of course filter faster, so the different types have different benefits. If you're
filtering something really nasty that's hard to clean, you can still use filter paper with them. But don't expect to be able to recover all of your
precipitate.
|
|
|
chemrox
International Hazard
Posts: 2961
Registered: 18-1-2007
Location: UTM
Member Is Offline
Mood: LaGrangian
|
|
At the end run the same solvent you recryx with through until clean and evaporate the filtrate. If the filtrate evaporates to yield a worthwhile
amount recryx it and see if you get enough to concern yourself with. BTW: I have used filter paper with sintered funnels and it has made recovery of
very fine residues easier. But, sometimes I've had to cut the paper to fit the funnel. A compass knife can help.
"When you let the dumbasses vote you end up with populism followed by autocracy and getting back is a bitch." Plato (sort of)
|
|
|
chemic_oll
Harmless
Posts: 7
Registered: 16-4-2015
Member Is Offline
Mood: No Mood
|
|
Thanks both of you.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
