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Suppose you are trying to separate a mixture of three compounds with the help of TLC....
betal Question 9 1 pts If you are given a mixture of three compounds like you...
betal Question 9 1 pts If you are given a mixture of three compounds like you were given in lab with the acetylferrocene/ferrocene mixture), what would be the proper order to separate and isolate those three compounds. 1st step Choose Run the column, collecting fractions in tared flasks Run a TLC of the three compounds in a fairly non-polar solvent such as hexanes Once the best eluent has been found, build a column using that event If the compounds are...
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...
1. A TLC experiment is performed to separate a mixture of the compounds shown below. 5.2...
1. A TLC experiment is performed to separate a mixture of the compounds shown below. 5.2 cm 4.8 cm • C 0-H O-H 2.3 cm • B OCH3 Phenol Cyclohexadiene m-anisic acid 1.1 cm • A a) Draw dipole arrows / dipole moments present for each molecule (if they have any) (2 points) b) The experiment yielded the TLC plate given on the left. Match each spot to one of the three molecules. For each compound, explain what makes it...
I need help with my pre and post lab questions. The three compounds below were spotted...
I need help with my pre and post lab questions.
The three compounds below were spotted on a TLC plate and developed to give the TLC plate shown. Which compound corresponds to which spot? Calculate the Rf value for spot B in the TLC plate shown above. When using polarity to determine the relative rates at which organic compounds travel up the TLC plate, we are considering compounds of similar molecular weight. It should also be noted that Rf values...
1. A TLC experiment is performed to separate a mixture of the compounds shown below. Label...
1. A TLC experiment is performed to separate a mixture of the compounds shown below. Label each chemical with the appropriate letter based off the TLC data. (2 points) • B OCH 2. What would happen to the Rivalues for your compounds if 30:70 hexane:acetone were used as the developing solvent instead of 70:30 hexane:acetone? Briefly explain why. (2 points) 3. After first using 90:10 hexane:acetone as the solvent, we switched to 70:30 hexane:acetone. Why did we not use 70:30...
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...
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...
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...
Suppose a student develops two compounds (A & B) in three separate developing chambers containing three...
Suppose a student develops two compounds (A
& B) in three separate developing chambers
containing three different solvent systems (1, 2, & 3). The
following Rf are produced:
Which solvent system worked the best for separation of compounds
A and B? How do you know?
Solvent System # Compound A Rf Value 0.50 0.40 0.60 Compound B Rf Value 0.73 0.50 0.90 3
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...
betal Question 9 1 pts If you are given a mixture of three compounds like you were given in lab with the acetylferrocene/ferrocene mixture), what would be the proper order to separate and isolate those three compounds. 1st step Choose Run the column, collecting fractions in tared flasks Run a TLC of the three compounds in a fairly non-polar solvent such as hexanes Once the best eluent has been found, build a column using that event If the compounds are...
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...
1. A TLC experiment is performed to separate a mixture of the compounds shown below. 5.2 cm 4.8 cm • C 0-H O-H 2.3 cm • B OCH3 Phenol Cyclohexadiene m-anisic acid 1.1 cm • A a) Draw dipole arrows / dipole moments present for each molecule (if they have any) (2 points) b) The experiment yielded the TLC plate given on the left. Match each spot to one of the three molecules. For each compound, explain what makes it...
I need help with my pre and post lab questions.
The three compounds below were spotted on a TLC plate and developed to give the TLC plate shown. Which compound corresponds to which spot? Calculate the Rf value for spot B in the TLC plate shown above. When using polarity to determine the relative rates at which organic compounds travel up the TLC plate, we are considering compounds of similar molecular weight. It should also be noted that Rf values...
1. A TLC experiment is performed to separate a mixture of the compounds shown below. Label each chemical with the appropriate letter based off the TLC data. (2 points) • B OCH 2. What would happen to the Rivalues for your compounds if 30:70 hexane:acetone were used as the developing solvent instead of 70:30 hexane:acetone? Briefly explain why. (2 points) 3. After first using 90:10 hexane:acetone as the solvent, we switched to 70:30 hexane:acetone. Why did we not use 70:30...
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...
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...
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...
Suppose a student develops two compounds (A
& B) in three separate developing chambers
containing three different solvent systems (1, 2, & 3). The
following Rf are produced:
Which solvent system worked the best for separation of compounds
A and B? How do you know?
Solvent System # Compound A Rf Value 0.50 0.40 0.60 Compound B Rf Value 0.73 0.50 0.90 3
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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