Homework Answers
Q.6. When should a mixed solvent system be used for TLC? Explain.
Ans- It is frequently the situation that a substance is seen as extremely soluble in one solvent and excessively insoluble in another solvent. For this situation, a mixed solvent system (utilizing the two solvents) can be utilized. The two solvents must be miscible, in any case! Recrystallization is endeavored by first dissolving the substance at the boiling point of the solvent in which it is soluble. At that point, the hot solvent in which the substance is insoluble is circumspectly included until slight turbidity is created. The turbidity is then cleared by the expansion of a couple of drops of the hot first solvent and the blend is permitted to cool to room temperature.
Q.7. Is the order of elution of the components the same for TLC as for column chromatography?
Ans- No, since elution depends upon solvents and column chromatography might be changed too, so the time isn't always constant.
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Thin layer chromatography
6. When should a mixed-solvent system be used for TLC? Explain. 7. Is...
2. An unknown compound was analyzed using thin layer chromatography, its constituted of two components (A...
2. An unknown compound was analyzed using thin layer chromatography, its constituted of two components (A and B) as shown in the TLC (Silica coated stationary phase; Chloroform and Ethyl acetate as mobile phase). The mixture was then loaded onto column with silica as the stationary phase and the same solvent system was used. (2 points) Column Chromatography TLC time A В Predict the order of elution of the compounds (A and B). which one would be eluted first/last and...
1. What are the main differences between thin layer chromatography (TLC) and column chromatography (CC)? 2. Are CC...
1. What are the main differences between thin layer chromatography (TLC) and column chromatography (CC)? 2. Are CC and TLC operations conducted concurrently? Explain. 3. Name a few packing materials used in packing columns in Column Chromatography operations. 4. Explain the role of eluting solvent(s) in column chromatography procedures. 5. When performing column chromatography, which of the following compounds would you expect to elute first: Ferrocene of acetylferrocene? Explain why.
11. Why should you use pencil instead of pen when marking on a thin layer chromatography...
11. Why should you use pencil instead of pen when marking on a thin layer chromatography plate? a. Pencil lead isn't as dark. b. The components of pen ink will separate along with your sample, while pencil lead will not. c. Pen ink will not mark on a TLC plate. d. Pen ink will undergo a chemical reaction with the solvent. 12. Which of the following is not a reason to use thin-layer chromatography? a. To determine the number of...
6. Why is it necessary to perform a thin layer chromatography (TLC) before carrying out the...
6. Why is it necessary to perform a thin layer chromatography (TLC) before carrying out the Column chromatography? (0.75 points)
Thin Layer Chromatography (TLC) is a common technique that is routinely used in chemistry labs. It...
Thin Layer Chromatography (TLC) is a common technique that is routinely used in chemistry labs. It is simple, inexpensive, and very useful. Select the TRUE statement. More polar compounds travel faster on a TLC plate than less polar compounds. If compound A has a smaller Rf value than compound B, we can conclude that compound A is more polar than B. The stationary phase of a TLC silica gel plate is nonpolar. Rr is calculated as the distance traveled...
In thin layer chromatography, would a more polar solvent increase or decrease the Rf values. Explain...
In thin layer chromatography, would a more polar solvent increase or decrease the Rf values. Explain your answer by referring to TLC theory (stationary phase, moving phase, polarity...)
1.a IR spectroscopy and Thin Layer Chromatography (TLC) is very convenient in tracking reactions. Explain How...
1.a IR spectroscopy and Thin Layer Chromatography (TLC) is very convenient in tracking reactions. Explain How you used both IR and TLC to track your reaction. Was your reaction complete when you did your initial TLC check? If so, how can you tell? 1.b Discuss how yield can be correlated to the efficacy of a reaction? Why are yields never 100%?
Can you help me answer the questions for the Introduction/Background? 1. Introduced the techniques of thin-layer...
Can you help me answer the questions for the
Introduction/Background?
1. Introduced the techniques of thin-layer and flask column
chromatography. Discuss how a solvent is elected as eluent.
2. Discuss all the applications of TLC. What is it used for?
3. Discuss the mobile and stationary phases of TLC and column
chromatography.
4. Explain how column chromatography can be used to separate a
mixture on a larger scale than TLC.
Post-Lab: Objective State the objective of the experiment in your...
1. What is the purpose of Thin-Layer Chromatography (TLC)? 2. What are the phases involved in...
1. What is the purpose of Thin-Layer Chromatography (TLC)? 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....
8.5 TLC is commonly employed with column chromatography to monitor the separation of colorless compounds. The...
8.5 TLC is commonly employed with column chromatography to monitor the separation of colorless compounds. The column is allowed to elute into many containers, usually test tubes. This is followed by a TLC on a long plate containing the same stationary phase as the column chromatography. Since a large number of tubes must be spotted, by spotting only every other (or every three etc.) tube on the plate. After visualization (by UV), the TLC plate is used to judge which...
2. An unknown compound was analyzed using thin layer chromatography, its constituted of two components (A and B) as shown in the TLC (Silica coated stationary phase; Chloroform and Ethyl acetate as mobile phase). The mixture was then loaded onto column with silica as the stationary phase and the same solvent system was used. (2 points) Column Chromatography TLC time A В Predict the order of elution of the compounds (A and B). which one would be eluted first/last and...
1. What are the main differences between thin layer chromatography (TLC) and column chromatography (CC)? 2. Are CC and TLC operations conducted concurrently? Explain. 3. Name a few packing materials used in packing columns in Column Chromatography operations. 4. Explain the role of eluting solvent(s) in column chromatography procedures. 5. When performing column chromatography, which of the following compounds would you expect to elute first: Ferrocene of acetylferrocene? Explain why.
6. Why is it necessary to perform a thin layer chromatography (TLC) before carrying out the Column chromatography? (0.75 points)
Can you help me answer the questions for the
Introduction/Background?
1. Introduced the techniques of thin-layer and flask column
chromatography. Discuss how a solvent is elected as eluent.
2. Discuss all the applications of TLC. What is it used for?
3. Discuss the mobile and stationary phases of TLC and column
chromatography.
4. Explain how column chromatography can be used to separate a
mixture on a larger scale than TLC.
Post-Lab: Objective State the objective of the experiment in your...
1. What is the purpose of Thin-Layer Chromatography (TLC)? 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....
8.5 TLC is commonly employed with column chromatography to monitor the separation of colorless compounds. The column is allowed to elute into many containers, usually test tubes. This is followed by a TLC on a long plate containing the same stationary phase as the column chromatography. Since a large number of tubes must be spotted, by spotting only every other (or every three etc.) tube on the plate. After visualization (by UV), the TLC plate is used to judge which...
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