During the TLC plate you notice all of the spots remain on the baseline. What is...
During the TLC plate you notice all of the spots remain on the baseline. What is the problem and how would you fix it?
Homework Answers
If all the spots remained on baseline , this indicates that the solubility of spots in the developing solvent (eluent) is zero and spots aren't mixing within eluent(mobile phase) at all .
To fix this problem we have to change the mobile phase solvent with opposite polarity new solvent .
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During the TLC plate you notice all of the spots remain on the
baseline. What is...
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....
3) What two methods of visualizing spots on the TLC plate will you use in this lab? Why would you predict that the...
3) What two methods of visualizing spots on the TLC plate will you use in this lab? Why would you predict that the elution solvents (hexanes or ethyl acetate) would not be visible under UV visualization?
3. A chemist runs a TLC plate using alumina and petroleum ether. After 40 minutes, all...
3. A chemist runs a TLC plate using alumina and petroleum ether. After 40 minutes, all of the spots are still at the origin. How would you change the TLC conditions to produce a separation of the spots (compounds)?
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
1. A student spots an unknown sample on a TLC plate and develops it in dichloromehane solbv Only ...
help !!!
1. A student spots an unknown sample on a TLC plate and develops it in dichloromehane solbv Only one spot, for which the Ry value is 0.15, is observed. Does this indicate that the unknown material is a pure compound? What can be done to verify the purity of the sample?
1. A student spots an unknown sample on a TLC plate and develops it in dichloromehane solbv Only one spot, for which the Ry value is 0.15,...
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
1. What is the retention factor for the following TLC plate if the baseline is 1...
1. What is the retention factor for the following TLC plate if the baseline is 1 cm, elute solvent traveled 5cm, and the spot of interest traveled 2.5cm? a) 0.50 b) 1.6 c) 0.63 d) 1.4 10. Column chromatography employs both a stationary and a mobile phase. Which of the compounds listed below is commonly used as the stationary phase in column chromatography? a) decolonizing charcoal b) sodium bicarbonate c) benzoic acid d) silica gel
Rank the following compounds form most polar to most non-polar, amide, either carboxylic acid, hydrocarbon, and...
Rank the following compounds form most polar to most non-polar, amide, either carboxylic acid, hydrocarbon, and ketone. Which of these compounds is NOT UV active? Circle all that quality. March the spots to the compounds How would you fix this TLC plate? How would you fix this TLC plate?
7. (4 pt.) What two methods were used to visualize the spots on the developed TLC...
7. (4 pt.) What two methods were used to visualize the spots on the developed TLC plate?
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....
3) What two methods of visualizing spots on the TLC plate will you use in this lab? Why would you predict that the elution solvents (hexanes or ethyl acetate) would not be visible under UV visualization?
3. A chemist runs a TLC plate using alumina and petroleum ether. After 40 minutes, all of the spots are still at the origin. How would you change the TLC conditions to produce a separation of the spots (compounds)?
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
help !!!
1. A student spots an unknown sample on a TLC plate and develops it in dichloromehane solbv Only one spot, for which the Ry value is 0.15, is observed. Does this indicate that the unknown material is a pure compound? What can be done to verify the purity of the sample?
1. A student spots an unknown sample on a TLC plate and develops it in dichloromehane solbv Only one spot, for which the Ry value is 0.15,...
Rank the following compounds form most polar to most non-polar, amide, either carboxylic acid, hydrocarbon, and ketone. Which of these compounds is NOT UV active? Circle all that quality. March the spots to the compounds How would you fix this TLC plate? How would you fix this TLC plate?
7. (4 pt.) What two methods were used to visualize the spots on the developed TLC plate?
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