With the methods and GC columns used in organic labs, the volatility of the nitrotoluene products is the factor that is most responsible for the separation of the products in the GC. Predict the order of the nitrotoluene retention times expected in your chromatogram. Order from lowest (top) to highest (bottom) retention time. Drag and drop options into correct order and submit. For keyboard navigation... SHOW MORE V para-nitrotoluene ortho-nitrotoluene meta-nitrotoluene II II

With the methods and GC columns used in organic labs, the volatility of the nitrotoluene products is the factor that is most responsible for the separation of the products in the GC. Predict the order of the nitrotoluene retention times expected in your chromatogram. Order from lowest (top) to highest (bottom) retention time. Drag and drop options into correct order and submit. For keyboard navigation... SHOW MORE V para-nitrotoluene ortho-nitrotoluene meta-nitrotoluene II II

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter27: Gas Chromatography

Section: Chapter Questions

Problem 27.4QAP

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Peak Retention Time (minutes) Area 1.201 136501204 acetone 2.011 1253056 toluene ortho-product para-product 3.201 8340750 3.350 14890645 a) What was the relative percent yield of the ortho-product? b) What was the relative percent yield of the para-product? c) What was the relative percent yield of the product?
Look up the boiling point for each of the following compounds then determine the order that they will elute from the column. Use this elution order to identify the compound in each of the 6 standard chromatograms. Once you have identified the compound in each chromatogram, record its retention time. Compound Structure Compound Name Elution Order (1-6) Non polar → Polar Boiling Retention Time (From Chromatograms) Point Propyl acetate H H. H. Butyl acetate H. H. H H. H H. H. H. Methanol H O- Ethanol 2-butanone H H H. H. 4-methyl-2- pentanone H. H. HH H.
With a balanced chemical reaction, table of physical properties, theore etc. as outlined in Appendix B. Pre-lab question 1 Homework Unanswered Which of the following is NOT a factor that affects GC retention time? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. Carrier gas flow rate Type of column used C. Structure of the molecule d. Concentration of the sample Subm Unanswered E NMRworksheetH...pdf CamScanner 02-...pdf CamScanner 02-.pdf lo
6) You are given a mixture of organic compounds suspected of containing various amines (e. g. 4-chloroaniline). What is the best way to quickly separate these amines from the other organic compounds? a) Perform a fractional distillation on the mixture. b) Benchtop silica gel column chromatography. c) Dissolve the mixture in an organic solvent and treat the solution with aqueous HCI. d) Dissolve the mixture in an organic solvent and treat the solution with aqueous NaOH.
Task: You are a forensic analyst employed at the Baltimore County Forensic Lab. You plan to perform paper chromatography on the ink from the note and a sample from the marker. Permanent marker ink is non-polar. You need to select the best solvent to use as the mobile phase in order to compare the ink sample and determine if they may be a match. The solvents you have available to you are carbon tetrachloride and water.Which solvent would be best to analyze the ink samples using paper chromotography?Your explanation should include:• the name of the liquid solvent that should be used for the paper chromatography analysis• scientific reasoning for your choice of the liquid solvent that will be used• the Lewis structures for carbon tetrachloride, CCl4, and water, H2O• how the shape and symmetry of each molecule influences its polarity
▪ In a blood alcohol analysis by GC-FID, methanol elutes at 1 min, ethanol at 2 min, IPA at 3 min, and IS at 4 min. In the patient sample, the analyte elutes t 2 min and the IS at 8 min. What is the relative retention time and the analyte in the patient? A) methanol B) Ethanol chu C) IPA
4. You are developing a GC method to separate xylene isomers (xylenes are benzene rings with two methyl groups, which can be oriented ortho, meta, and para to each other). In the first run, the peaks come out too close together. If you want to increase retention, you should: a) Run the column at a higher temperature b) Run the column at a lower temperature c) Inject a larger volume d) Inject a smaller volume e) None of These
Answer sections C, D and E in the same answer book. Section D (Chromatography) Question 8 The following data were obtained for the analysis of a mixture of compounds (A-D) by HPLC: Peak Retention time (min) | Width of peak base (min) non-retained 2.1 A 6.4 10.51 B 11.3 1.03 C 13.1 1.25 D 21.6 1.62 a) Using peak C. calculate the number of plates (N) in this column. b) For peak D, calculate the capacity factor (k'). c) For peak B and C, calculate the resolution (R).
Using the chromatogram shown here, which was obtained on a 2-m column, determine values for tr, w, t', k', N, and H. Nonretained solutes 100 200 300 400 500 Retention time (s) Signal
Which compound elutes first and last in reverse chromatography
Table 1: Selected phytocomponents identified in the plant extract. Retention time, min Name of Compound 10.767 Benzaldehyde 15.790 Azulene 16.002 1-Piperazinecarboxaldehyde 17.935 Phthalan 20.731 2-methoxy-1,3,4-trimethybenzene 24.028 Methylesterpentanoic acid 26.993 Tetradecamethylcycloheptasiloxane 31.753 Hexadecamethyl Cyclooctasiloxane If GC is combined with MS, what data you will add as the 3rd column in Table 1 above. Fill in that data for each of the select identified phytocomponents.
With the methods and GC columns used in organic labs, the volatility of the nitrotoluene products is the factor that is most responsible for the separation of the products in the GC. Predict the order of the nitrotoluene retention times expected in your chromatogram. Order from lowest (top) to highest (bottom) retention time. Para-Nitrotolulene, Meta-Nitrotolulene, Ortho-Nitrotolulene