Homework Answers
a) The eluent that can be used is ethyl acetate:hexane (30:70) as all the compounds are not highly polar compounds.
b) As, B being the most nonpolar compound it will elute first folowed by A and in the last C which is relatively polar as compared to A and B
c) Increasing polarity will result in poor separation of the compounds as the the difference in Rf of the compounds will be less and they might run at the same speed on the TLC plate.
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10. Consider the separation of the mixture of the compounds shown below using TLC analysis using...
Hi can someone help me with my pre lab theory questions (1,2,3) on rate of elution...
Hi can someone help me with my pre lab theory questions (1,2,3)
on rate of elution or Rf? Here is some background below. Please
help explain as many as possible (1-3)! I dont really get the
relation ships in this lab, thank you!
1. What factors affect the rate of elution in organic compounds? 2. Explain what is the relationship between polarities of compounds (polar/non- polar compound) and rate of elution (Rf). 3. Explain what is the relationship between solvent...
Please help 2. Consider the TLC plate shown below that was done on silica gel using...
Please help
2. Consider the TLC plate shown below that was done on silica gel using a solvent mixture of 4:1 hexane/EtoAc as the eluent. 4:1 Hexane:EtOAC marked solvent front Spot B Spot A A origin (a) Which of the two organic compounds labeled A and B is less polar? (b) Calculate the Rf value of compound B. (c) How would the following changes affect the Rf values of A and B? i. Change to a more polar solvent mixture...
6. Silica gel was used as the solid support for the TLC plate. Which of the...
6. Silica gel was used as the solid support for the TLC plate.
Which of the three compounds (A, B, or C) in the APPLIED MIXTURE is
the least polar? (See the figure attached.)
8. Which compound below will have the highest Rf on a TLC
plate? Explain your reasoning. (See figure attached.)
10. The following TLC plates have been spotted with two
different compounds and are about to be eluted. For each plate,
explain if it has been spotted...
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...
Chm 250 please help ASAP Thank you and it's in exam Below is a TLC plate...
Chm 250 please help ASAP
Thank you and it's in exam
Below is a TLC plate in which silica gel is the stationary phase. (1) What does "TLC" stand for? (2) For samples 1 through 5 which one contains the compound of largest polarity? Explain your answer. (3) Based on the TLC result, what are the components of mixture M?
A student monitored the reaction progress of the reduction of 4-Nitrobenzaldehyde to 4-Nitrobenzyl alcohol using TLC....
A student monitored the reaction progress of the reduction of
4-Nitrobenzaldehyde to 4-Nitrobenzyl alcohol using TLC. 30% ethyl
acetate in petroleum ether was used as the elution solvent. TLC
plates available in the laboratory were coated with the common
absorbent silica gel (SiO2.xH2O) which
contains polar hydroxyl (OH-) groups.
c. The crude product moves slower
than the starting material with the mobile
phase in the TLC plate. Briefly
explain a possible reason for the
observation based on the chemical
structures...
TLC Consider the following silica gel TLC plate of compounds A, B, and developed in hexanes:...
TLC Consider the following silica gel TLC plate of compounds A, B, and developed in hexanes: solvent front 0 D origin A B C 22. Determine the Ry values of compounds A, B, and Crun on a silica gel TLC plate using hexanes as the solvent. 23. Which compound, A, B, or C, is the most polar? 24. What would you expect to happen to the Ry values if you used acetone instead of hexanes as the eluting solvent? 25.TLC...
A TLC of an organic solid (acetyl salicylic acid, aspirin) was run in 4 different eluents....
A TLC of an organic solid (acetyl salicylic acid, aspirin) was run in 4 different eluents. Using your knowledge of TLC and polarity of these eluents, match the Rf of the aspirin to the eluent. 0.01 [Choose) 100% ethanol 90% hexanes, 10% ethanol 60% hexanes, 40% ethanol 100% hexanes 0.23 0.48 [Choose) 0.91 [Choose] Question 6 1 pts When building a column, a plug of glass wool is placed in bottom of the column, then the column is filled with...
Consider the following scenario: You have a mixture of phenol and anisol, your TLC is coated...
Consider the following scenario: You have a mixture of phenol and anisol, your TLC is coated with silica gel, and you will use ethyl acetate as your mobile phase. Which compound will travel a longer distance in the TLC plate? Explain your answer.
1. A mixture containing Compound X and Compound Y is analyzed using silica gel TLC. a....
1. A mixture containing Compound X and Compound Y is analyzed using silica gel TLC. a. If Compound X has an Rf value of 0.7 and Compound Y has an Rvalue of 0.3, which compound is more polar? Explain. b. The solvent traveled 50 mm. How far did Compound Y travel? 2. Why isn't it reasonable for an R. value to be greater than 1? 3. How many spots would you expect to see if you conducted a TLC separation...
Hi can someone help me with my pre lab theory questions (1,2,3)
on rate of elution or Rf? Here is some background below. Please
help explain as many as possible (1-3)! I dont really get the
relation ships in this lab, thank you!
1. What factors affect the rate of elution in organic compounds? 2. Explain what is the relationship between polarities of compounds (polar/non- polar compound) and rate of elution (Rf). 3. Explain what is the relationship between solvent...
Please help
2. Consider the TLC plate shown below that was done on silica gel using a solvent mixture of 4:1 hexane/EtoAc as the eluent. 4:1 Hexane:EtOAC marked solvent front Spot B Spot A A origin (a) Which of the two organic compounds labeled A and B is less polar? (b) Calculate the Rf value of compound B. (c) How would the following changes affect the Rf values of A and B? i. Change to a more polar solvent mixture...
6. Silica gel was used as the solid support for the TLC plate.
Which of the three compounds (A, B, or C) in the APPLIED MIXTURE is
the least polar? (See the figure attached.)
8. Which compound below will have the highest Rf on a TLC
plate? Explain your reasoning. (See figure attached.)
10. The following TLC plates have been spotted with two
different compounds and are about to be eluted. For each plate,
explain if it has been spotted...
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...
Chm 250 please help ASAP
Thank you and it's in exam
Below is a TLC plate in which silica gel is the stationary phase. (1) What does "TLC" stand for? (2) For samples 1 through 5 which one contains the compound of largest polarity? Explain your answer. (3) Based on the TLC result, what are the components of mixture M?
A student monitored the reaction progress of the reduction of
4-Nitrobenzaldehyde to 4-Nitrobenzyl alcohol using TLC. 30% ethyl
acetate in petroleum ether was used as the elution solvent. TLC
plates available in the laboratory were coated with the common
absorbent silica gel (SiO2.xH2O) which
contains polar hydroxyl (OH-) groups.
c. The crude product moves slower
than the starting material with the mobile
phase in the TLC plate. Briefly
explain a possible reason for the
observation based on the chemical
structures...
TLC Consider the following silica gel TLC plate of compounds A, B, and developed in hexanes: solvent front 0 D origin A B C 22. Determine the Ry values of compounds A, B, and Crun on a silica gel TLC plate using hexanes as the solvent. 23. Which compound, A, B, or C, is the most polar? 24. What would you expect to happen to the Ry values if you used acetone instead of hexanes as the eluting solvent? 25.TLC...
A TLC of an organic solid (acetyl salicylic acid, aspirin) was run in 4 different eluents. Using your knowledge of TLC and polarity of these eluents, match the Rf of the aspirin to the eluent. 0.01 [Choose) 100% ethanol 90% hexanes, 10% ethanol 60% hexanes, 40% ethanol 100% hexanes 0.23 0.48 [Choose) 0.91 [Choose] Question 6 1 pts When building a column, a plug of glass wool is placed in bottom of the column, then the column is filled with...
1. A mixture containing Compound X and Compound Y is analyzed using silica gel TLC. a. If Compound X has an Rf value of 0.7 and Compound Y has an Rvalue of 0.3, which compound is more polar? Explain. b. The solvent traveled 50 mm. How far did Compound Y travel? 2. Why isn't it reasonable for an R. value to be greater than 1? 3. How many spots would you expect to see if you conducted a TLC separation...
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