1) What will be the appearance of a TLC plate if a solvent of too low...
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1) What will be the appearance of a TLC plate if a solvent of too low...
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...
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?
1) A student develops their TLC plate and places it under a UV light, but nothing...
1) A student develops their TLC plate and places it under a UV light, but nothing appears. What mistake might the student have made? a) Spotted the compound below the level of eluent b) Spotted the compound above the level of eluent c) Used a sample that was too concentrated d) Used too much sample 2)Thin layer chromatography, TLC, is commonly used to monitor reactions to completion. Using this technique, what would indicate to a student that the reaction is...
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...
1. When separating mixtures using TLC, why is it important to choose a solvent (mobile phase)...
1. When separating mixtures using TLC, why is it important to choose a solvent (mobile phase) that has a different polarity than the TLC plate (stationary phase)? 2. Why will some substances in a mixture travel farther up the TLC plate than others?
What will be the result of applying too much compound to a TLC plate ?
What will be the result of applying too much compound to a TLC plate ?
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.
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?
1. To see plant pigment extracts or pigments such as carotene on the TLC plate? 2....
1. To see plant pigment extracts or pigments such as carotene on the TLC plate? 2. When recrystallizing a material if too much solvent is used, how might this impact the percent recovery? 3. For an extraction to be successful, the organic layer should be immiscible or miscible with the aqueous layer (so that a separation can take place)? 4. When recrystallizing a material if too much solvent is used, how might this impact the percent recovery?
Place approximately 10 mg of each of the four reference compounds in labeled vials or 10 X 75-mm ...
can you solve this for me,
please
Place approximately 10 mg of each of the four reference compounds in labeled vials or 10 X 75-mm test tubes and dissolve the samples in a few drops of methanol. In a fifth tube place a quarter of an analgesic tablet and add 1 mL of methanol. Crush the tablet with a rod, stir well, and allow the insoluble material to settle. Note that aspirin is not stable in methanol, so fresh solutions...
1. When separating mixtures using TLC, why is it important to choose a solvent (mobile phase) that has a different polarity than the TLC plate (stationary phase)? 2. Why will some substances in a mixture travel farther up the TLC plate than others?
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.
can you solve this for me,
please
Place approximately 10 mg of each of the four reference compounds in labeled vials or 10 X 75-mm test tubes and dissolve the samples in a few drops of methanol. In a fifth tube place a quarter of an analgesic tablet and add 1 mL of methanol. Crush the tablet with a rod, stir well, and allow the insoluble material to settle. Note that aspirin is not stable in methanol, so fresh solutions...
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