Posted by ~christina~ on Monday, April 20, 2009 at 11:56pm.
hm...I was just reading that a flame ionization detector does not respond to water?
now I'm confused.
I don't know what to tell you. Does more than one sharp peak on the GC mean you had more than one solvent? An alternative might be that the solvent used was not very pure and the GC is picking up the main solvent plus the impurities. Perhaps the broad peak at the end was some of the solute and not water? What do you usually use as a drying agent? Here is a list of some common drying agents but I would try it on a small part of the sample just in case the solvent reacts with the drying agent you choose.
I did see more than one solvent. That's what I was saying, but the last peak didn't look like a solvent peak. It just looked like a hill compared with the other peaks that were sharp.
I have never used a drying agent in this particular lab before. I guess Drierite is a desiccant that we have available, and that I mentioned experimenting with above.
Drierite is CoCl2.
The problem I have is that I'm not believing what I'm seeing. It did not turn from blue to pink like it would if it had water and the solvent just evaporated quickly after touching the drierite.
BUT if there was water and there was just more organic solvent in the layer, wouldn't it do the same as the above described situation?
Drierite is not CoCl2. I believe it is anhydrous CaSO4. INDICATING drierite has CoCl2 added to it; the CoCl2 is the indicator of water. Blue when no water, pink with water. CaSO4 without the CoCl2 would be my first choice as a drying agent if you need one.
Okay, I'll try that then.
Wait, the whole problem here is to determine whether there is or there is not water in the solvent layer.
Utilizing the CaSO4 to dry the layer would not tell me if there was or was not water.
Is there any way to determine if there is water in solvent layer?
science(chemistry) - I have a question about solvent evaporation. If I had an ...
science(chemistry) - When performing vacuum filtration of a solid in an unknown ...
Chemistry - 1. If you became confused and did not know whether a flask contains ...
chemistry - In the extraction of an organic compound from a dilute aqueous ...
Org. Chem. - what is the precipitate formed when HCl is added? I believe the ...
Organic Chemistry - Q: Each of the solvent given should effectively separate one...
organic chemistry - Why does the alkyl halide layer switch from the top layer to...
chemistry - 1)when benzoic acid and quinine is dissolved in CH2Cl2 and added 2M ...
CHEMISTRY - Why does the solvent move upward in thin layer chromatography
Organic Chem - Q: Each of the solvent given should effectively separate one of ...
For Further Reading