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Chromatography I Questions Name CHE 201 Date The following solvent systems were found to separate compounds...
2. An unknown compound was analyzed using thin layer chromatography, its constituted of two components (A...
2. An unknown compound was analyzed using thin layer chromatography, its constituted of two components (A and B) as shown in the TLC (Silica coated stationary phase; Chloroform and Ethyl acetate as mobile phase). The mixture was then loaded onto column with silica as the stationary phase and the same solvent system was used. (2 points) Column Chromatography TLC time A В Predict the order of elution of the compounds (A and B). which one would be eluted first/last and...
The student loads the solid onto a column, prepacked with silica gel, and elutes the column...
The student loads the solid onto a column, prepacked with silica gel, and elutes the column with an appropriate solvent system to allow the components to be completed separated. 11. Based on your understanding of column chromatography, which of the following solvent systems is most likely to yield the best separation of the two components in this mixture? Please explain your answer BRIEFLY (5 pts)! The ranking of solvent polarity is: MeOH>ethyl acetate> hexane (ie, MeOH is the most polar)....
Consider the two compounds of trans-stillbene or p-tolylmethanol, a) Which compound has a lower Rf value...
Consider the two compounds of trans-stillbene or p-tolylmethanol, a) Which compound has a lower Rf value when the mixture is developed in a 3:1 hexane/ether solvent system? Explain. b) Which compound would you expect to come off first from the column when the eluting solvent is hexane first? Explain. c) What happens if you use hexane as an only eluting solvent throughout the chromatography? Explain. d) (Continue from c) Or if you use ethyl ether as an only eluting solvent?...
Page 4. A stadent wanted to separate compounds A, B and C by column chromatography. Before...
Page 4. A stadent wanted to separate compounds A, B and C by column chromatography. Before deciding on a mobile phase, he ran TLC in the three solvent systems he was considering for this experiment, solvent 1, solvent 2 and solvent 2 (shown below).(10 points) Based on the TLC results what can you conclude reganding the polarity of compounds A, B and CT a. b. What can you conclude reganding the polarity of the mobille phases solvent 1, 2 and...
4. You plan to separate a mixture of the two compounds below using a column chromatography...
4. You plan to separate a mixture of the two compounds below using a column chromatography normal conditions, which of the compounds would you expect to be eluted off the column first? Expla
I have a mixture of three compounds and I want to separate them. The compounds are...
I have a mixture of three compounds and I want to separate them. The compounds are ethyl aminobenzoate (50%), benzoin (40%), and 1,4-dibromobenzene(10%). I started the experiment by dissolving the mixture in the methylene chloride, then I added HCl, so I got two layers, first one is aqueous layer that contain ethyl aminobenzoate, and the second one is organic layer that contain benzoin and 1,4-dibromobenzene. After that I add NaOH to aqueous layer and I got a solid, then I...
4. Consider the following silica gel TLC plac or compounds A, B, and hexines: developed in...
4. Consider the following silica gel TLC plac or compounds A, B, and hexines: developed in Fo-o- og a) Determine the Rr values of compounds A, B, and C run on a silica gel TLC plate using hexanes as the solvent b) Which compound, A, B, or C. is the most polar? values if you used acetone instead c) What would you expect to happen to the of hexanes as the eluting solvent? 5) Consider a sample that is a...
3) Assume that you are given a mixture of compound A and compound B, and it...
3) Assume that you are given a mixture of compound A and compound B, and it is your job to separate them. You are also given the following table of information. a. Describe in detail how you would separate these two compounds. Tell what solvent or solvents you would use, and explain your choice(s). R, in pure ethyl acetate 0.90 0.80 R, in 100% hexane R, in 50% ethyl Compound A 0.70 opoB 0.05 acetate in hexane 0.85 0.50 b....
ANSWER ALL 1) Which of the following is the stationary phase in size exclusion chromatography? A....
ANSWER ALL 1) Which of the following is the stationary phase in size exclusion chromatography? A. resin B. mixture of proteins C. solvent or buffer D. none of these 2) Suppose you wish to purify a protein that has many positively charged residues from a mixture of proteins. Which of the following columns would elute the protein the fastest? A. column packed with neutral resin B. column packed with positively charged resin C. column packed with negatively charged resin D....
1. What is the purpose of column chromatography 2. What is the stationary phase? Mobile phase?...
1. What is the purpose of column chromatography 2. What is the stationary phase? Mobile phase? 3. What is the purpose of the cotton (glass wool) in column chromatography? 4. What is the purpose of the sand? 5. Why is it important to prevent the column from drying? 6. What can happen if you disrupt your even layer of silica gel? 7. Which compounds come off the column first, polar or nonpolar? 8. Keyon synthesized acetylferrocene (orange) in organic chemistry...
2. An unknown compound was analyzed using thin layer chromatography, its constituted of two components (A and B) as shown in the TLC (Silica coated stationary phase; Chloroform and Ethyl acetate as mobile phase). The mixture was then loaded onto column with silica as the stationary phase and the same solvent system was used. (2 points) Column Chromatography TLC time A В Predict the order of elution of the compounds (A and B). which one would be eluted first/last and...
The student loads the solid onto a column, prepacked with silica gel, and elutes the column with an appropriate solvent system to allow the components to be completed separated. 11. Based on your understanding of column chromatography, which of the following solvent systems is most likely to yield the best separation of the two components in this mixture? Please explain your answer BRIEFLY (5 pts)! The ranking of solvent polarity is: MeOH>ethyl acetate> hexane (ie, MeOH is the most polar)....
Page 4. A stadent wanted to separate compounds A, B and C by column chromatography. Before deciding on a mobile phase, he ran TLC in the three solvent systems he was considering for this experiment, solvent 1, solvent 2 and solvent 2 (shown below).(10 points) Based on the TLC results what can you conclude reganding the polarity of compounds A, B and CT a. b. What can you conclude reganding the polarity of the mobille phases solvent 1, 2 and...
4. You plan to separate a mixture of the two compounds below using a column chromatography normal conditions, which of the compounds would you expect to be eluted off the column first? Expla
4. Consider the following silica gel TLC plac or compounds A, B, and hexines: developed in Fo-o- og a) Determine the Rr values of compounds A, B, and C run on a silica gel TLC plate using hexanes as the solvent b) Which compound, A, B, or C. is the most polar? values if you used acetone instead c) What would you expect to happen to the of hexanes as the eluting solvent? 5) Consider a sample that is a...
3) Assume that you are given a mixture of compound A and compound B, and it is your job to separate them. You are also given the following table of information. a. Describe in detail how you would separate these two compounds. Tell what solvent or solvents you would use, and explain your choice(s). R, in pure ethyl acetate 0.90 0.80 R, in 100% hexane R, in 50% ethyl Compound A 0.70 opoB 0.05 acetate in hexane 0.85 0.50 b....
1. What is the purpose of column chromatography 2. What is the stationary phase? Mobile phase? 3. What is the purpose of the cotton (glass wool) in column chromatography? 4. What is the purpose of the sand? 5. Why is it important to prevent the column from drying? 6. What can happen if you disrupt your even layer of silica gel? 7. Which compounds come off the column first, polar or nonpolar? 8. Keyon synthesized acetylferrocene (orange) in organic chemistry...
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