For 29, please explain how you would find the distance from the starting point t

Question

For 29, please explain how you would find the distance from the starting point to the center of the solvent in order to calculate RT (retention time).

Gas Chromatography and Simple Distillation. Use the results from GC injections of a distillate and pot residue obtained from a simple distillation of a two component mixture to answer the questions below. Write your answers on the Answer Sheet. (5 pts each) GC Settings GC Settings GC #2 GC #1 Injection Volume 1uL injection Volume 1uL Chart Speed 1 mm/sec Chart Speed 5 mm/sec Column Temp 150 °C Column Temp 500 *C Column Pressure S 10 psi Column Pressure 10 psi 20 mm *Chromatograms may not be drawn to scale. Peak A: 20 mm Peak C: h 8 mm 15 mm 13 mm W1/2 6 mm 1/2 4 mm Peak D: h 25 mm Peak B: 6 mm 14 mm 16 mm W1/2 5 mm 1/2 10 mm 28. What is the percentage of the higher boiling point component in the distillate? 29 Calculate the distance to the center of peak A and the retention time. (You do not need a ruler to answer this question. All the information is provided.)

Explanation / Answer

28. From the above two sheets

boiling point of components in increasing order : C < D < A < B

B is the highest boiling component in sheet 1 and D is highest boiling component in sheet 2

area A = 1/2(20 x 6) = 30 mm^2

area B = 1/2(6 x 5) = 15 mm^2

percentage higher boiling B = 15 x 100/45 = 33.33%

area C = 1/2(8 x 4) = 8 mm^2

area D = 1/2(25 x 10) = 125 mm^2

percentage higher boiling D = 125 x 100/133 = 93.98%

29. Retention time is defined as the distance between the component and the solvent

For A, RT = distance at center of component - start center of solvent peak

Similarly RT for other components B, C and D can be calculated

So, like for C, RT = 20 mm - 0 mm = 20 mm

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