chemistry
chemistry
Hi
Does anyone have success when filtering Barium Sulfate? We use Buchner Funnels with the filter paper for barium sulfate from Sc Supply and vacuum pumps on taps but we still don't seem to have success as the sulfate goes through the paper and the solution in the side arm flask is always milky.
Does anyone have success when filtering Barium Sulfate? We use Buchner Funnels with the filter paper for barium sulfate from Sc Supply and vacuum pumps on taps but we still don't seem to have success as the sulfate goes through the paper and the solution in the side arm flask is always milky.
- rae
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- School: Oxley College
- Suburb: Burradoo
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Re: chemistry
We use Gooch crucibles with the side arm flasks and vacuum pumps and have had great success. The gooch crucible is a sintered glass crucible with a porcelain filter in the bottom. I think the No.4 is what you need. They are expensive but have always worked for us.
Re: chemistry
Buy Whatman filter papers - No 40 could be the one you need but ask the supplier. They are expensive.
- Mother
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Re: chemistry
I was going to suggest Whatman Grade 42 filters.
Mother
Mother
- Loopy
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- School: Mater Dei Catholic College
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Re: chemistry
We have good results using Chemistry Contexts 2nd edition prac 3.2 which uses a 0.1% agar solution as a coagulant.
It says " The BaSO4 precipitate is exceedingly fine and is extremely difficult to filter without the uses of agar solution as a coagulating agent. The procedure is valid because the filtrate is clear of any BaSO4 and any agar retained with the BaSO4 residue is of immeasurable mass. If all of the agar was retained, it would add 0.01g to the BaSO4 residue. The sensitivity of the standard laboratory electronic balance is 0.01g"
Hope this helps....
It says " The BaSO4 precipitate is exceedingly fine and is extremely difficult to filter without the uses of agar solution as a coagulating agent. The procedure is valid because the filtrate is clear of any BaSO4 and any agar retained with the BaSO4 residue is of immeasurable mass. If all of the agar was retained, it would add 0.01g to the BaSO4 residue. The sensitivity of the standard laboratory electronic balance is 0.01g"
Hope this helps....
Lou P.
Learner Lab Technician
Wagga Wagga
NSW
Learner Lab Technician
Wagga Wagga
NSW
- rae
- Posts: 1045
- Joined: 31 May 2006, 10:00
- School: Oxley College
- Suburb: Burradoo
- State/Location: NSW
Re: chemistry
Loopy is it possible to get a copy of that prac?
- Loopy
- Posts: 592
- Joined: 08 Jun 2006, 10:00
- School: Mater Dei Catholic College
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- State/Location: NSW
Re: chemistry
I will try. My IT capabilities rate very low!....
Lou P.
Learner Lab Technician
Wagga Wagga
NSW
Learner Lab Technician
Wagga Wagga
NSW
- Loopy
- Posts: 592
- Joined: 08 Jun 2006, 10:00
- School: Mater Dei Catholic College
- Suburb: Wagga Wagga
- State/Location: NSW
Re: chemistry
Here goes, sorry about the writing on the pages....
You do not have the required permissions to view the files attached to this post.
Lou P.
Learner Lab Technician
Wagga Wagga
NSW
Learner Lab Technician
Wagga Wagga
NSW
- rae
- Posts: 1045
- Joined: 31 May 2006, 10:00
- School: Oxley College
- Suburb: Burradoo
- State/Location: NSW
Re: chemistry
Thanks Loopy it worked a treat!!
- ELIZABETH
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- Suburb: Armidale
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Re: chemistry
Thanks indeed!
Re: chemistry
Hi Loopy
Is it possible to have a copy of the "Barium Sulfate /Agar" prac too.
Thanks
Glenpaul
Is it possible to have a copy of the "Barium Sulfate /Agar" prac too.
Thanks
Glenpaul
- Loopy
- Posts: 592
- Joined: 08 Jun 2006, 10:00
- School: Mater Dei Catholic College
- Suburb: Wagga Wagga
- State/Location: NSW
Re: chemistry
Hi all,
I hope the prac works well for those who try it. Glenpaul, I think the pdf is till available on this page for you to download. Let me know if there are any problems.
I hope the prac works well for those who try it. Glenpaul, I think the pdf is till available on this page for you to download. Let me know if there are any problems.
Lou P.
Learner Lab Technician
Wagga Wagga
NSW
Learner Lab Technician
Wagga Wagga
NSW