7. The following is a gas chromatogram for a sample containing compounds B, and C. area A = 75 area B = 25 intensity area C = 50 retention time (min) a) Which compound has the longest retention time? b) Which compound has the shortest retention time? c) Which compound has the lowest boiling point? d) Which compound has the highest boiling point? e) If you increased the oven temperature inside the GC, how would this affect the retention times of the compounds? f) Calculate the percentage of compound C in the mixture. Show your work.

7. The following is a gas chromatogram for a sample containing compounds B, and C. area A = 75 area B = 25 intensity area C = 50 retention time (min) a) Which compound has the longest retention time? b) Which compound has the shortest retention time? c) Which compound has the lowest boiling point? d) Which compound has the highest boiling point? e) If you increased the oven temperature inside the GC, how would this affect the retention times of the compounds? f) Calculate the percentage of compound C in the mixture. Show your work.

EBK A SMALL SCALE APPROACH TO ORGANIC L

4th Edition

ISBN:9781305446021

Author:Lampman

Publisher:Lampman

Chapter88: Column Chromatography

Section: Chapter Questions

Problem 4P

See similar textbooks

Similar questions

Answer as established by thin ayer chromatography: 1. The value of Rf will always be: A. less than or equal to 1b. less than or equal to 0c. greater than or equal to 1d. None of the above
1. Identify the products on your GC chromatogram using the Rf values of the compoundscompared the Rf of the standards.2. Calculate the percent composition for each compound using a ruler to measure.
Analysis of an unknown plant extract yield two peaks X and Y in a chromatogram, 15.65 and 17.03 min respectively in a 30.0 cm column. The peak base width for X is 1.06 and 1.15 for Y. The average number of plates in the column is
The following Rf values were computed from a normal phase chromatography experiment. Arrange them from most polar to least polar. I - 0.25 II - 0.84 III - 0.56 IV- 0.67 Group of answer choices II > IV > III > I I > III > IV > II I > II > III > IV IV > II > III > I
1. What is the retention time of molecule 9?2. What happens to the peak area if the sample amount is doubled?3. If run time is stopped at 5.5 mins, will molecules 8 & 6 be separated and quantified?4. If the flow rate was doubled, will 8&6 be separated and quantified?5. Does a single peak at time T in the chromatogram indicate only one compound is eluted?
A new dye (DYE C) was developed and was analyzed against other dyes using paper chromatography. A solution 1:1 ethyl acetate: hexane was used as the eluent. The resulting chromatogram is shown at the photo. Determine the retention factor (Rf) values of each spot on dye C and what are the other dye/s present in dye C.
The separation factor for two compounds in gas chromatography is 1.022 on a column with a plate height of 0.375 mm. The retention factor for compound 1 is 4.85. a) Find the retention factor for compound 2 b) What length of column will separate the compounds with a resolution of 1.3? c) The retention time for air [tm] is 1.00 minute. If the plate number is the same for both compounds, find [tr] and w1/2 for each peak. d) If the volume ratio of the stationary phase to mobile phase is 0.25, find the distribution constant for compound 1.
During Size exclusion chromatography, if VT = 30 mL, Vs = 15 cm3 , and VL = 15 mL, Vi is 7 mL 8 mL Not enough information 15 mL
Analysis of an unknown plant extract yield two peaks X and Y in a chromatogram, 15.65 and 17.03 min respectively in a 30.0 cm column. The peak base width for X is 1.06 and 1.15 for Y. The analysis gave a column resolution equal to?
2. Different marker inks were analyzed using a simple paper chromatographyexperiment. Two marker inks were dissolved separately in a solvent and spottedin the chromatogram. The mobile phase used was 1% NaCl and three inkstandards (A-copper-phthalocyanine blue, B-diarylide yellow,C- lithol rubine red)were spotted beside the two sample markers. After the chromatography, thechromatogram showed a separation of colors in the two inks (D and E).a. Calculate the retention factor for each spot from lanes A to E .b. Which ink standard was the most polar? least polar?c. What is the composition of ink D ?
1. The flame-ionization detector is used in gas chromatography because the eluates cannot be detected by UV. True False 2. All chromatographic techniques can be used as separation methods. True False
The flame-ionization detector is used in gas chromatography because the eluates cannot be detected by UV. True False