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July 27, 2015

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

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