What is one explanation for aspirin streaking on a TLC plate but not caffeine? Give the...
What is one explanation for aspirin streaking on a TLC plate but not caffeine? Give the most likely explanation that relates to the structures of these molecules.
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What is one explanation for aspirin streaking on a TLC plate but
not caffeine? Give the...
2. Aspirin, acetaminophen, and caffeine are some of the substances being tested in this TLC experiment....
2. Aspirin, acetaminophen, and caffeine are some of the substances being tested in this TLC experiment. Look at their structures and atoms present to help you explain why 100% hexane would NOT be a good TLC developing solvent (chromatography solvent) to use in this Thin Layer Chromatography experiment.
4. Predict the TLC behavior to be expected from the three Anacin components (aspirin, caffeine, and...
4. Predict the TLC behavior to be expected from the three Anacin components (aspirin, caffeine, and 1,4-dimethoxybenzene). Assume you spot a plate with three standard solutions, each containing one of the components. Sketch what you expect the developed TLC plate to look like and identify which compound is which spot. 5. Draw a picture of the test tube with the prepared solution of the model compound and the prepared buffer and the beam of the UV spectrometer beam passing through...
In your TLC analysis of Anacin it is quite likely that you were able to see...
In your TLC analysis of Anacin it is quite likely that you were able to see another spot in addition to that for the acetylsalicylic acid (aspirin) (an idealized TLC of Anacin is shown below). This is because in addition to acetylsalicyclic acid, Anacin also contains some caffeine. Ignoring detailed intermolecular forces for now, state which would be described as more POLAR in the context of TLC, aspirin or caffeine? In answering this question you will realize that hydrogen-bonding is...
2. While caffeine is very soluble in water, aspirin is only minimally soluble. a. Clearly explain...
2. While caffeine is very soluble in water, aspirin is only minimally soluble. a. Clearly explain why you think caffeine is soluble in water. b. In order to dissolve the aspirin, I had to use a sodium hydroxide solution (this is why you had to add HCl to the separatory funnel.) Clearly explain how the use of a sodium hydroxide solution allowed the aspirin to dissolve. Structures/reaction(s) will likely help your answer.
Consider caffeine and acetaminophen: What structural features (functional groups) cause one to move farther than the...
Consider caffeine and acetaminophen: What structural features (functional groups) cause one to move farther than the other on the TLC plate?
QUESTIONS 1. In your own words, explain how the components of a mixture are separated during...
QUESTIONS 1. In your own words, explain how the components of a mixture are separated during thin layer chromatography. Do not explain how to perform TLC; in other words do not explain the procedure. 2. Explain the purpose of the UV lamp in this experiment. 3. Why must you use pencil, not pen, when you make marks on the TLC plate? How do you know? Be sure to 4. Which substances were in the OTC pain reliever? discuss your Rr...
2. What are the phases involved in TLC? 3. What is coated on the TLC plate?...
2. What are the phases involved in TLC? 3. What is coated on the TLC plate? 4. What is the purpose of lining the wall of the TLC chamber with paper? 5. Why is it important to use a small amount of the mobile phase? 6. Why should you remove the TLC plate before the mobile phase reaches the top? 7. What type of compounds are visible with UV light? 8. With a polar stationary phase and non-polar mobile phase,...
Possible Quiz Questions 1 What two methods of visualizing spots on a TLC plate will you...
Possible Quiz Questions 1 What two methods of visualizing spots on a TLC plate will you use in this Give two reasons why would you predict that the elution solvents (hexanes or acetate) would not be visible under UV visualization? week's lab? ethyl 2. Define R 3. Calculate the R of the spot on the following TLC plate. 4. Which compound in each pair is predicted to have the higher Ri? a. CH3CH2CH2CH2OH and CH3CH2CH2CH28r b. CH3CH2CH2CH2OH and CH3CH2CH2CH2CH2CH2CH3 c....
1. Calculate the Rf values for spots A and B on the TLC plate drawn below....
1. Calculate the Rf values for spots A and B on the TLC plate drawn below. Based on the Rf values which compound (A or B) is most likely to be more polar? a. Calculate Rf values for A and B b. Which compound A or B will most likely be polar? Why?
Were your isolated compounds pure based on TLC? If not, with what were they contaminated?
Were your isolated compounds pure based on TLC? If not, with what were they contaminated?I'm not sure what exactly it's asking me as far as what they were contaminated with. Also, the Rf values for TLC for standard and isolated were as follows:Standard Isolatedaspirin: 3.6 cm/5.6 cm= 0.643 cm ...
2. Aspirin, acetaminophen, and caffeine are some of the substances being tested in this TLC experiment. Look at their structures and atoms present to help you explain why 100% hexane would NOT be a good TLC developing solvent (chromatography solvent) to use in this Thin Layer Chromatography experiment.
4. Predict the TLC behavior to be expected from the three Anacin components (aspirin, caffeine, and 1,4-dimethoxybenzene). Assume you spot a plate with three standard solutions, each containing one of the components. Sketch what you expect the developed TLC plate to look like and identify which compound is which spot. 5. Draw a picture of the test tube with the prepared solution of the model compound and the prepared buffer and the beam of the UV spectrometer beam passing through...
In your TLC analysis of Anacin it is quite likely that you were able to see another spot in addition to that for the acetylsalicylic acid (aspirin) (an idealized TLC of Anacin is shown below). This is because in addition to acetylsalicyclic acid, Anacin also contains some caffeine. Ignoring detailed intermolecular forces for now, state which would be described as more POLAR in the context of TLC, aspirin or caffeine? In answering this question you will realize that hydrogen-bonding is...
2. While caffeine is very soluble in water, aspirin is only minimally soluble. a. Clearly explain why you think caffeine is soluble in water. b. In order to dissolve the aspirin, I had to use a sodium hydroxide solution (this is why you had to add HCl to the separatory funnel.) Clearly explain how the use of a sodium hydroxide solution allowed the aspirin to dissolve. Structures/reaction(s) will likely help your answer.
QUESTIONS 1. In your own words, explain how the components of a mixture are separated during thin layer chromatography. Do not explain how to perform TLC; in other words do not explain the procedure. 2. Explain the purpose of the UV lamp in this experiment. 3. Why must you use pencil, not pen, when you make marks on the TLC plate? How do you know? Be sure to 4. Which substances were in the OTC pain reliever? discuss your Rr...
2. What are the phases involved in TLC? 3. What is coated on the TLC plate? 4. What is the purpose of lining the wall of the TLC chamber with paper? 5. Why is it important to use a small amount of the mobile phase? 6. Why should you remove the TLC plate before the mobile phase reaches the top? 7. What type of compounds are visible with UV light? 8. With a polar stationary phase and non-polar mobile phase,...
Possible Quiz Questions 1 What two methods of visualizing spots on a TLC plate will you use in this Give two reasons why would you predict that the elution solvents (hexanes or acetate) would not be visible under UV visualization? week's lab? ethyl 2. Define R 3. Calculate the R of the spot on the following TLC plate. 4. Which compound in each pair is predicted to have the higher Ri? a. CH3CH2CH2CH2OH and CH3CH2CH2CH28r b. CH3CH2CH2CH2OH and CH3CH2CH2CH2CH2CH2CH3 c....
1. Calculate the Rf values for spots A and B on the TLC plate drawn below. Based on the Rf values which compound (A or B) is most likely to be more polar? a. Calculate Rf values for A and B b. Which compound A or B will most likely be polar? Why?
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