1) What error is introduced in determining the Rf value if the solvent is allowed to...
1) What error is introduced in determining the Rf value if the solvent is allowed to run after it reaches the height of the TLC plate?
2) What problem will occur if the pool of solvent (mobile phase) is at the level of the sample spots on the TLC plate?
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1) What error is introduced in determining the Rf value if the
solvent is allowed to...
1) Calculate the Rf value of a spot that travels 5.7 cm, with a solvent front...
1) Calculate the Rf value of a spot that travels 5.7 cm, with a solvent front that travels 13 cm. 2) A student spots an unknown sample on a TLC plate and develops it in pentane solvent. Only one spot, for which the Rf value is 0.05, is observed. Is the unknown material a pure compound? What can be done to verify the purity of the sample using thin-layer chromatography? 3) You try to synthesize n-hexyl bromide as a product...
I have two questions regarding TLC. 1.) What error is introduced into the determination of an...
I have two questions regarding TLC. 1.) What error is introduced into the determination of an Rf value if the solvent front migrates to the top of the top of the TLC plate? 2.) Why is the TLC run in a closed chamber?
Determine the Rf value of the substances A, B, and C on the TLC shown. Show...
Determine the Rf value of the substances A, B, and C on the TLC
shown. Show your calculation!
What will happen if the applied spot is lower than the level of
the developing liquid?
What will be the result of applying too much compound on a TLC
plate?
What is the reason that the mobile phase travels up the silica
gel plate (TLC plate)?
4. Determine the Rf value of the substances A, B, and Con the TLC shown. Show...
Please draw a thin chromatography plate with the following terms labelled 1. Origin 2. Stationary Phase...
Please draw a thin chromatography plate with the following
terms labelled
1. Origin 2. Stationary Phase 3. Mobile Phase 4. Solvent Front 5. Component "spot" 6. Rf value 7. Development 8. Visualization of spots Define questions 9 and 10 9. What is meant by differential partitioning between stationary and mobile phase? 10. What is the recommended procedure for cleaning a TLC spotting capillary?
Can someone please help me out with the Rf value PLEASE!! Thin Layer Chromatography Procedures 1)...
Can someone please help me out with the Rf value
PLEASE!!
Thin Layer Chromatography Procedures 1) Prepare a solvent solution in a 150 mL beaker by using 5 mL of Hexane and 3 mL of ethyl acetate Take one plate and spot (small spots) it with the three different standard solutions given. The standard solutions are 2-nitroaniline, 3-nitroaniline, and 4-nitroaniline. The fourth spot will be the unknown sample obtained. 2) 3) Align these spots at 1 cm from the bottom...
1. Propose a synthesis for aspirin, Ibuprofen and acetaminophen. Start with benzene and any other reagents...
1. Propose a synthesis for aspirin, Ibuprofen and acetaminophen. Start with benzene and any other reagents that contain 4 or less carbons. 2. What error is introduced into the determination of an Rf value if the solvent front migrates to the top of the TLC plate? 3. Why is the TLC run in a closed chamber?
3. If the TLC plate development had stopped before the solvent front reached the top of...
3. If the TLC plate development had stopped before the solvent front reached the top of the TLC plate (i.e. maybe it reached the middle of the TLC plate when it was stopped, instead): a) Would the Rf values have been affected? If so, how? If not, why not? Give a numerical example to support your answer. b) Would the size of the spots have been affected? If so, how? If not, why not? (Hint: think about the diffusion of...
1. When 2-propanol was used as the developing solvent, two substances moved with the solvent front...
1. When 2-propanol was used as the developing solvent, two substances moved with the solvent front (Rf= 1) during TLC analysis on a silica gel plate. Can you conclude that they are identical? If not, what additional experiment(s) would you perform? 2. The Rf value of compound A is 0.34 when a TLC plate is developed in hexane and 0.44 when the plate is developed in diethyl ether. Compound B has an Rf value of 0.42 in hexane and 0.60...
Problem 1 Thin layer Chromatography consist of three parts: The analyte, the stationary phase and mobile...
Problem 1 Thin layer Chromatography consist of three parts: The analyte, the stationary phase and mobile phase. Match each of these terms to what is was in out experiment. Stationary Phase ____ a) The solvent Mobile Phase ____ b) Silica Analyte ____ c) One of the analgesiscs Problem 2 Complete the sentences Analytes on a TLC should have a(n) _________ Rf in a less polar solvent. Analytes on a TLC should have a(n) _________ Rf in a more polar solvent....
Huie Turva polar better with higher solvent stationary phase Study Problem: A mixture of organic compounds...
Huie Turva polar better with higher solvent stationary phase Study Problem: A mixture of organic compounds was analyzed by TLC using different solvent mixtures as mobile pha and the results are presented in the diagram below. Compare the TLC plates A-D with the one on the left and answer th questions: a) How is the polarity of the mobile phase used to TLC plate A comparative with plate on the left? b) How are the Ri's value on the plate...
1) Calculate the Rf value of a spot that travels 5.7 cm, with a solvent front that travels 13 cm. 2) A student spots an unknown sample on a TLC plate and develops it in pentane solvent. Only one spot, for which the Rf value is 0.05, is observed. Is the unknown material a pure compound? What can be done to verify the purity of the sample using thin-layer chromatography? 3) You try to synthesize n-hexyl bromide as a product...
Determine the Rf value of the substances A, B, and C on the TLC
shown. Show your calculation!
What will happen if the applied spot is lower than the level of
the developing liquid?
What will be the result of applying too much compound on a TLC
plate?
What is the reason that the mobile phase travels up the silica
gel plate (TLC plate)?
4. Determine the Rf value of the substances A, B, and Con the TLC shown. Show...
Please draw a thin chromatography plate with the following
terms labelled
1. Origin 2. Stationary Phase 3. Mobile Phase 4. Solvent Front 5. Component "spot" 6. Rf value 7. Development 8. Visualization of spots Define questions 9 and 10 9. What is meant by differential partitioning between stationary and mobile phase? 10. What is the recommended procedure for cleaning a TLC spotting capillary?
Can someone please help me out with the Rf value
PLEASE!!
Thin Layer Chromatography Procedures 1) Prepare a solvent solution in a 150 mL beaker by using 5 mL of Hexane and 3 mL of ethyl acetate Take one plate and spot (small spots) it with the three different standard solutions given. The standard solutions are 2-nitroaniline, 3-nitroaniline, and 4-nitroaniline. The fourth spot will be the unknown sample obtained. 2) 3) Align these spots at 1 cm from the bottom...
1. When 2-propanol was used as the developing solvent, two substances moved with the solvent front (Rf= 1) during TLC analysis on a silica gel plate. Can you conclude that they are identical? If not, what additional experiment(s) would you perform? 2. The Rf value of compound A is 0.34 when a TLC plate is developed in hexane and 0.44 when the plate is developed in diethyl ether. Compound B has an Rf value of 0.42 in hexane and 0.60...
Huie Turva polar better with higher solvent stationary phase Study Problem: A mixture of organic compounds was analyzed by TLC using different solvent mixtures as mobile pha and the results are presented in the diagram below. Compare the TLC plates A-D with the one on the left and answer th questions: a) How is the polarity of the mobile phase used to TLC plate A comparative with plate on the left? b) How are the Ri's value on the plate...
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