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Example 3. Consider a Thin layer chromatography experiment of compounds A, B, C and D using 50:50 Acetone : Eth...
Example 3. Consider a Thin layer chromatography experiment of compounds A, B, C and D using...
Example 3. Consider a Thin layer chromatography experiment of compounds A, B, C and D using 50:50 Acetone Ether showed four spots under UV light (3 points) a) Calculate the Rf values for all spots A, B and C-show your work b) Match spots A, B, C and D with the four compounds below? solvent front A С В Но Но ОН ОН
A chemist runs a thin–layer chromatography (TLC) plate and, after development, forgets to mark the solvent...
A chemist runs a thin–layer chromatography (TLC) plate and, after development, forgets to mark the solvent front. The chemist doesn\'t realize this until the solvent has evaporated. Assuming that accurate Rf values are needed, select the correct course of action for the chemist. a. Assume that the solvent front is at the top of the plate. b. Dip the plate in phosphomolybdic acid (PMA) and heat the plate with a heat gun. c. Run the TLC analysis of these samples...
2. The diagram below shows the results of a simple thin layer chromatography experiment. height reached...
2. The diagram below shows the results of a simple thin layer chromatography experiment. height reached by the solvent the "solvent font a) Describe briefly, but precisely, what you would have done in order to get to this stage. You can assume that you have been given a suitable thin layer chromatography plate. b) Why is there a cover on the beaker? c) In order to help identify the things in a chromatogram, you can measure the Rf value for...
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....
Case C Thin Layer Chromatography 1. TOXI-LAB is a screening method that uses: chromatography (column /...
Case C Thin Layer Chromatography 1. TOXI-LAB is a screening method that uses: chromatography (column / planar) The first step consists of the extraction of drug metabolites from biological fluids when we place the sample in a test tube containing a mixture of solvents and buffering salts that cause the extraction of basic and neutral drugs. The solvent extract of the sample is concentrated by heat and evaporation, then is deposited onto a small disc of chromatographic media (small circle...
Laboratory Instructor STUDENT REPORT A. Data Sheet EXPERIMENT 28 Aspartame 1. Thin-layer chromatography Distance traveled by...
Laboratory Instructor STUDENT REPORT A. Data Sheet EXPERIMENT 28 Aspartame 1. Thin-layer chromatography Distance traveled by solvent (1) Substance Distance teweled DR value Calculations: 2. KMnO, test Observations 10 min. 15 min. Reaction? 5 min. Substance 1092 330 Exploring Chemistry 3. Cari nitrate test B. Reflective Exercises and phenylalanine columns on the 1. How many spots should be seen for each of the aspartic acid and price chromatogram? Why? 2. Referring to the chromatogram, what did you here and what...
2. If two different compounds have the same Rr value, how might they be identified using paper chromatography?...
2. If two different compounds have the same Rr value, how might they be identified using paper chromatography? 3. Why is it important to keep the spots on the paper as small as possible? 4. If the solvent pool at the bottom of the beaker touched the spots on the 1.5cm line, what would happen to the spots? How would you address this error? 5. If you were teaching a student how to do paper chromatography, what three pieces of...
The following sketch shows the results of a paper chromatography experiment. At the beginning, pure substances...
The following sketch shows the results of a paper chromatography experiment. At the beginning, pure substances A, B, and C were spotted at the points labeled as "x" marks. The dotted line shows the solvent front. The Rf values of A, B, and C are respectively 0.25, 0.75, and 0.50. Where would you expect the spots for the three substances to be when the experiment is completed? Sketch rough circles. 100 BO + 60 40 20 0 x B CHY-CH-CH-CH)...
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...
How would you separate compounds A, B, C and D below and they were mixed using...
How would you separate compounds A, B, C and D below and they
were mixed using an extraction experiment. Assume the compounds are
soluble in dichloromethane and you have at your disposal HCl, NaOH,
NaHCO3. Show your answer in a form of flow chart and include all
steps including which layer is which.
OH OCH
Example 3. Consider a Thin layer chromatography experiment of compounds A, B, C and D using 50:50 Acetone Ether showed four spots under UV light (3 points) a) Calculate the Rf values for all spots A, B and C-show your work b) Match spots A, B, C and D with the four compounds below? solvent front A С В Но Но ОН ОН
2. The diagram below shows the results of a simple thin layer chromatography experiment. height reached by the solvent the "solvent font a) Describe briefly, but precisely, what you would have done in order to get to this stage. You can assume that you have been given a suitable thin layer chromatography plate. b) Why is there a cover on the beaker? c) In order to help identify the things in a chromatogram, you can measure the Rf value for...
Case C Thin Layer Chromatography 1. TOXI-LAB is a screening method that uses: chromatography (column / planar) The first step consists of the extraction of drug metabolites from biological fluids when we place the sample in a test tube containing a mixture of solvents and buffering salts that cause the extraction of basic and neutral drugs. The solvent extract of the sample is concentrated by heat and evaporation, then is deposited onto a small disc of chromatographic media (small circle...
Laboratory Instructor STUDENT REPORT A. Data Sheet EXPERIMENT 28 Aspartame 1. Thin-layer chromatography Distance traveled by solvent (1) Substance Distance teweled DR value Calculations: 2. KMnO, test Observations 10 min. 15 min. Reaction? 5 min. Substance 1092 330 Exploring Chemistry 3. Cari nitrate test B. Reflective Exercises and phenylalanine columns on the 1. How many spots should be seen for each of the aspartic acid and price chromatogram? Why? 2. Referring to the chromatogram, what did you here and what...
2. If two different compounds have the same Rr value, how might they be identified using paper chromatography? 3. Why is it important to keep the spots on the paper as small as possible? 4. If the solvent pool at the bottom of the beaker touched the spots on the 1.5cm line, what would happen to the spots? How would you address this error? 5. If you were teaching a student how to do paper chromatography, what three pieces of...
The following sketch shows the results of a paper chromatography experiment. At the beginning, pure substances A, B, and C were spotted at the points labeled as "x" marks. The dotted line shows the solvent front. The Rf values of A, B, and C are respectively 0.25, 0.75, and 0.50. Where would you expect the spots for the three substances to be when the experiment is completed? Sketch rough circles. 100 BO + 60 40 20 0 x B CHY-CH-CH-CH)...
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...
How would you separate compounds A, B, C and D below and they
were mixed using an extraction experiment. Assume the compounds are
soluble in dichloromethane and you have at your disposal HCl, NaOH,
NaHCO3. Show your answer in a form of flow chart and include all
steps including which layer is which.
OH OCH
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