Homework Answers
A pure compound, when spotted and developed on a TLC plate should appear as a single spot.
Two (or more) spots in a single "lane" indicate that the compound is impure
Their fore the unknown compoun is pure it shows single spot
The larger an Rf of a compound, the larger the distance it travels on the TLC plate. When comparing two different compounds run under identical chromatography conditions, the compound with the larger Rf is less polar because it interacts less strongly with the polar adsorbent on the TLC plate
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1. A student spots an unknown sample on a TLC plate and develops it in dichloromehane solbv Only ...
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...
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...
10. On the TLC plate below, identify the spots in the unknown mixture as compound A,...
10. On the TLC plate below, identify the spots in the unknown mixture as compound A, B, and C and calculate all Rt values. Lanes with X are unknown sample spots. State whether the solvent system used is a great one for the separation of the compounds. + A B X
10. On the TLC plate below, identify the spots in the unknown mixture as compound A,...
10. On the TLC plate below, identify the spots in the unknown mixture as compound A, B. and C and calculate all Rf values. Lanes with X are unknown sample spots. State whether the solvent system used is a great one for the separation of the compounds. С X В X A
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....
One student ran a TLC of an unknown compound on a silica gel plate and the...
One student ran a TLC of an unknown compound on a silica gel plate and the distance from the starting line to the solvent front was 4 centimeters. the compound being analyzed had Rf of 0.25. Another student was analyzing another unknown compound by TLC on an identical plate but the distance from the starting line to the solvent front was 5 cm and the distance from the starting line to the compound was 1.25 cm. Are the students compounds...
Was your recrystallized sample pure by TLC? What were the potential impurities and how...
looking at TLC attached f(filtrate), p(purified crystals)
a(starting aniline ) s(salicylaldehyde) , can somebody answer these
questions for me ?? and calculate RF
Was your recrystallized sample pure by TLC? What
were the potential impurities and how did you confirm their
identities? What was the most polar spot on the
TLC? Does this data make sense based on the structure of
the compound responsible for that spot?
Ple he fel .preseru, 'Y/spots. Letor e.
Ple he fel .preseru, 'Y/spots. Letor...
Below is a picture of a TLC plate by a student using this technique and developing...
Below is a picture of a TLC plate by a student using this
technique and developing a TLC plate for the first time. You can
see that the yellow compound from the spot is actually traveling
downward and into the solution, as opposed to upward with a
capillary action. The reason for this failed attempt is a major
error in the performed technique,acommon mistake about which the
student was warned multiple times prior to the lab work. What did
she...
CAN SOMONE PLEASE HELP. above is a picture of two TLC plates with spots on them....
CAN SOMONE PLEASE HELP. above is a picture of two TLC plates
with spots on them. could somone PLEASE PLEASE PLEASE help me get
their measurmentS (in milimeters) and help me calculate their Rf
values!!! I promise to rate u good if you could help!!! Im so
confused!!! THANK U SM
-solvent front scluent front Acetaminophen (A Afine (caf) Unknown mixture Phenacetin (Phn) Salicyamide (sal) Plate 2 Untuan unknown ixture mixture duplicate spots Plate 1 ASSIGNMENT In this experiment, TLC...
2. A solution containing a mixture of naphthalene, benzoic acid, and benzaldehyde is analyzed via TLC...
2. A solution containing a mixture of naphthalene, benzoic acid, and benzaldehyde is analyzed via TLC and GC. Use the structures and properties of the compounds to aid in answering the following questions. A. In the TLC experiment, the mixture is spotted on a silica TLC plate and eluted with a 1:1 mixture of hexanes and ethyl acetate. Three spots are observed on the plate, with Re values of 0.25, 0.58, and 0.74. Indicate which spot corresponds to which compound....
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...
10. On the TLC plate below, identify the spots in the unknown mixture as compound A, B, and C and calculate all Rt values. Lanes with X are unknown sample spots. State whether the solvent system used is a great one for the separation of the compounds. + A B X
10. On the TLC plate below, identify the spots in the unknown mixture as compound A, B. and C and calculate all Rf values. Lanes with X are unknown sample spots. State whether the solvent system used is a great one for the separation of the compounds. С X В X A
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....
looking at TLC attached f(filtrate), p(purified crystals)
a(starting aniline ) s(salicylaldehyde) , can somebody answer these
questions for me ?? and calculate RF
Was your recrystallized sample pure by TLC? What
were the potential impurities and how did you confirm their
identities? What was the most polar spot on the
TLC? Does this data make sense based on the structure of
the compound responsible for that spot?
Ple he fel .preseru, 'Y/spots. Letor e.
Ple he fel .preseru, 'Y/spots. Letor...
Below is a picture of a TLC plate by a student using this
technique and developing a TLC plate for the first time. You can
see that the yellow compound from the spot is actually traveling
downward and into the solution, as opposed to upward with a
capillary action. The reason for this failed attempt is a major
error in the performed technique,acommon mistake about which the
student was warned multiple times prior to the lab work. What did
she...
CAN SOMONE PLEASE HELP. above is a picture of two TLC plates
with spots on them. could somone PLEASE PLEASE PLEASE help me get
their measurmentS (in milimeters) and help me calculate their Rf
values!!! I promise to rate u good if you could help!!! Im so
confused!!! THANK U SM
-solvent front scluent front Acetaminophen (A Afine (caf) Unknown mixture Phenacetin (Phn) Salicyamide (sal) Plate 2 Untuan unknown ixture mixture duplicate spots Plate 1 ASSIGNMENT In this experiment, TLC...
2. A solution containing a mixture of naphthalene, benzoic acid, and benzaldehyde is analyzed via TLC and GC. Use the structures and properties of the compounds to aid in answering the following questions. A. In the TLC experiment, the mixture is spotted on a silica TLC plate and eluted with a 1:1 mixture of hexanes and ethyl acetate. Three spots are observed on the plate, with Re values of 0.25, 0.58, and 0.74. Indicate which spot corresponds to which compound....
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