A mixture of three compounds Phen-A, Acet-B and Rin-C was analyzed using TLCwith 1:9 ethanol: hexane as the mobile phase. The TLC plate showed three spotsof R, 0.1 and 0.2 and 0.3.Which of the three compounds (Phen-A; Acet-B or Rin-C) would have the highest(Blank 1), middle (Blank 2) and lowest (Blank 3) spot respectively?0CH:0CH,0H.COHH.CNOHAcet-BRin-Cphen-AAA<

Solvent (1:9 ethanol:hexane) is almost nonpolar as it contains 90% of non-polar hexane. So…

Answered: A mixture of three compounds Phen-A,…

Chemical Principles in the Laboratory

11th Edition

ISBN:9781305264434

Author:Emil Slowinski, Wayne C. Wolsey, Robert Rossi

Publisher:Emil Slowinski, Wayne C. Wolsey, Robert Rossi

Chapter2: Resolution Of Matter Into Pure Substances, I.paper Chromatography

Section: Chapter Questions

Problem 1ASA

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A particular mixture was seperated into three components usin paper chromatography. the Rf value of dye A is 0.78, the Rf of dye B is 0.43 and the Rf of dye C is 0.19. What component of the mixture A,B,C is most attracted in the stationery phase and why?
6
In an experiment of Reverse Phase chromatography using C-18 stationary phase and a mixture of methanol/ethyl acetate/acetic acid, a researcher tried to separate the 3 compounds shown below. Which compound would have the lowest Rf and which the highest Rf in this experiment? Explain your answer and show any relevant structures.
In a chromatographic separation of two components A and B. Component A has a higher Rf value than component B. This implies that: A. Component B has a higher affinity than A for the mobile phaseB. component B elutes first in the columnC. A has a higher affinity than B for the mobile phaseD. Component A has a higher affinity than B for the stationary phase.
Which of the following pairs of compounds would be most easily separated by thin layer chromatography: n-octyl alcohol and 1-octene, hexadecane and octadecane, or chlorobenzene and bromobenzene?
1. A mixture containing 0.500 mM chloroform and 0.800 mM DDT gave signals of 15.3 UA for chloroform and 10.1 uA for DDT. An unknown solution (10.0 mL) containing DDR was places in a 100 mL volumetric flask and 10.2 ul, of chloroform (FM 119.39, density = 1.484 g/mL) were added. After dilution to the mark with solvent, polarographic signals of 29.4 and 8.7 uA were observed for the chloroform and DDT, respectively. Find the concentration of DDT in the unknown.
4. You analyze a mixture of cyclopentane, pyrrolidine, and tetrahydrofuran by gas chromatography and obtain the following GC trace. H N O cyclopentane pyrrolidine tetrahydrofuran area A = 100 A intensity area B = 70 B area C = 180 retention time (min) a) Label the peaks on the GC trace with the compounds they correspond to. Explain how you made your assignments. (Hint: look up the boiling points of the compounds.)
A3
Each time a mixture containing equal amounts of compounds A, B,and C is injected into a gas chromatograph, compound B gives a signal thatis only one-third the size of the signal from compound A, and compoundC gives a signal that is three times the size of the signal from the compoundA. When another mixture of these same three compounds, but which doesnot necessarily contain equal amounts of each, is injected into a gas chromatograph the area of the signals from A, B, and C are 105, 404, and 230 square units respectively. Calculate the percent of each component inthis second mixture.
You and another student were each given an unknown compound. Both samples contained colorless material. You each used the same brand of commercially prepared TLC plate and developed the plates using the same solvent. Each of you obtained a single spot of Rf = 0.75. Were the two samples necessarily the same substance? How could you prove unambiguously that they were ily identical using TLC?
A solution was prepared by mixing 12.49 mg of B plus 10.00 mL of unknown containing A and just diluting to 25.00 mL. Peak areas of 5.97 and 6.38 were observed for A and B, respectively. Find the concentration of A (mg/L) in the unknown.

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