Name_______________________ Section___________

1. If you inject aqueous NaCl solution into the GC, what would you expect in your chromatogram? Explain.

2. What problems would be expected if your detector burns with a luminous (yellow) flame,
instead of a blue flame? Describe how it would affect the detector signal.

3. The number of theoretical plates, N, is a measure of efficiency of a GC column.
Calculate the peak widths, wB, for a substance run on two different columns, one with N=70.0,
the other with N=7000., assuming the retention time, tR, is 100.0 sec for both columns.

4. Calculate how the increase in N will affect the peak height, H, for the substance above
if identical amounts (Areas) are injected into the two different columns?

5. In our GC, we injected 0.20 ml of CH2Cl2 vapor at 22 oC and 1.00 atm. What mass of CH2Cl2
was injected, assuming this is an ideal gas? PV=nRT. R= 0.082 L atm/mole K MWt=84.93