April 17, 2014

Homework Help: science(chemistry) -Q for Dr.Bob

Posted by ~christina~ on Monday, April 20, 2009 at 11:56pm.

solvent layer: 1
solid precipitate: no

I ran the solvent layer I got in my unknown in the GC and I had sharp peaks in the beginning but at about 4 min on the polar column, I got a broad peak that tailed off considerably.

question is, Is it water?
I'm not sure how water would look if you had it in your sample after placing it in the GC. (Peak can't be the unknown compound because it's not volatile, right?)

I don't know how to make sure that there is no water in solvent layer either. Couldn't there be one layer if you have a polar solvent + water?
I tried to put a drop of the solvent layer on drierite to see if it changed from blue to pink, but it did not.
Does this mean that there is no water? couldn't it mean that there is more organic solvent than water as well?

Second test I did for water was adding solvent layer to water and shaking. It was partially miscible but not completely. (polar solvent?)

Is there any sure method to determine if there is water in solvent layer or not?

Thanks Dr.Bob

Answer this Question

First Name:
School Subject:

Related Questions

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 ...