chemic_oll - 29-7-2015 at 11:56
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 - 29-7-2015 at 12:06
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 - 29-7-2015 at 13:19
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.
chemic_oll - 29-7-2015 at 23:03
Thanks both of you.