If acetaminophen is used in a TLC experiment with 100 % ethyl acetate as the solvent...
If acetaminophen is used in a TLC experiment with 100 % ethyl acetate as the solvent system, explain in terms of polarity why the spot would move fast or slow up the TLC plate?
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If acetaminophen is used in a TLC experiment with 100 % ethyl
acetate as the solvent...
If aspirin (acetylsalicylic acid) is used in a TLC experiment with 1:1 Hexanes / Ethyl acetate...
If aspirin (acetylsalicylic acid) is used in a TLC experiment with 1:1 Hexanes / Ethyl acetate as the solvent system, explain in terms of polarity why the spot would move fast or slow up the TLC plate?
A TLC plate was run in 1:1 ethyl acetate and hexane, but when developed the plate...
A TLC plate was run in 1:1 ethyl acetate and hexane, but when developed the plate only showed baseline spots. What change could be made to get the spot(s) to move further up the plate? -Spot a new plate and run again in the same solvent system -Spot a new plate and run in neat hexane -Spot a new plate and run in 1:2 ethyl acetate/hexane -Spot a new plate and run in 2:1 ethyl acetate/hexane
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...
Why would it be unwise to use 100% ethyl acetate as the first mobile phase you...
Why would it be unwise to use 100% ethyl acetate as the first mobile phase you test when determining the best mobile phase to separate the mixture of analgesics in Procedure? Why do polar compounds move slower up the silica TLC plates than nonpolar compounds? Why does increasing the polarity of the mobile phase increase the rate at which all compounds move up the plate?
Referring back to question 5 above, in the TLC plate on the left the eluting mobile...
Referring back to question 5 above, in the TLC plate on the left the eluting mobile phase solvent was ethyl acetate, in the plate on the right it was 97% ethyl acetate and 3% methanol. Explain why the Rf values in the plate on the right are larger than those in the plate on the left. Your explanation must be in the terms of intermolecular forces, you are not allowed to only use the word "polarity". There are THREE dynamical...
3. TLC analysis of an unknown sample using pure ethyl acetate as a developing solvent gives a single spot with an Rf va...
3. TLC analysis of an unknown sample using pure ethyl acetate as a developing solvent gives a single spot with an Rf value of 0.08 1 points A. Explain why this result does not guarantee that the sample is a pure compound. B. Suggest two changes that could be made to the experiment to improve the analysis of the unknown sample. 2 points Change 1 Change 2
Common solvents used in TLC analysis are hexane and ethyl acetate, the latter being more polar. A TLC has been performed...
Common solvents used in TLC analysis are hexane and ethyl acetate, the latter being more polar. A TLC has been performed on a mixture of two compounds. The solvent ran for 3 cm(plate length is 6cm) with 5% ethyl acetate in hexane. The two spots were not resolved, meaning they showed up too close to each other. What can you suggest to possible improve the results of the separation?
4. TLC Data: Provide a drawing of your TLC plate with proper labels, and specify which solvent system was used to d...
4. TLC Data: Provide a drawing of your TLC plate with proper labels, and specify which solvent system was used to develop the TLC. Comment on the purity of your product according to TLC. Explain why the newly produced phenacetin would run higher on the TLC plate compared to the starting material acetaminophen.
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.
The solvent: 70/30 (hexane/ethyl acetate) Compounds: Hexane, 70/30 (hexane/ethyl acetate), and 95/5 CH2Cl2/CH3OH I r ry...
The solvent: 70/30 (hexane/ethyl acetate)
Compounds: Hexane, 70/30 (hexane/ethyl acetate), and 95/5
CH2Cl2/CH3OH
I r ry Pus uey.UUT TU eu puru The solvent for TLC works well as separating these 3 compounds. Rationalize why it was chosen, discussing polarity of solvent and the 3 ferrocenes.
Why would it be unwise to use 100% ethyl acetate as the first mobile phase you test when determining the best mobile phase to separate the mixture of analgesics in Procedure? Why do polar compounds move slower up the silica TLC plates than nonpolar compounds? Why does increasing the polarity of the mobile phase increase the rate at which all compounds move up the plate?
Referring back to question 5 above, in the TLC plate on the left the eluting mobile phase solvent was ethyl acetate, in the plate on the right it was 97% ethyl acetate and 3% methanol. Explain why the Rf values in the plate on the right are larger than those in the plate on the left. Your explanation must be in the terms of intermolecular forces, you are not allowed to only use the word "polarity". There are THREE dynamical...
3. TLC analysis of an unknown sample using pure ethyl acetate as a developing solvent gives a single spot with an Rf value of 0.08 1 points A. Explain why this result does not guarantee that the sample is a pure compound. B. Suggest two changes that could be made to the experiment to improve the analysis of the unknown sample. 2 points Change 1 Change 2
4. TLC Data: Provide a drawing of your TLC plate with proper labels, and specify which solvent system was used to develop the TLC. Comment on the purity of your product according to TLC. Explain why the newly produced phenacetin would run higher on the TLC plate compared to the starting material acetaminophen.
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.
The solvent: 70/30 (hexane/ethyl acetate)
Compounds: Hexane, 70/30 (hexane/ethyl acetate), and 95/5
CH2Cl2/CH3OH
I r ry Pus uey.UUT TU eu puru The solvent for TLC works well as separating these 3 compounds. Rationalize why it was chosen, discussing polarity of solvent and the 3 ferrocenes.
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