a. Upon running a TLC, your sample barely moved from the origin point on the TLC...
a. Upon running a TLC, your sample barely moved from the origin point on the TLC plate. The mobile phase you used was 1:3 EtOAc and hexanes. What can you do to obtain a decent Rf value for your sample?
b. Between methyl phenyl ether and benzyl alcohol, which compound will have a higher Rf value?
Homework Answers
toAdd Answer to:
a. Upon running a TLC, your sample barely moved from the origin
point on the TLC...
Determine the Rf value of the substances A, B, and C on the TLC shown. Show...
Determine the Rf value of the substances A, B, and C on the TLC
shown. Show your calculation!
What will happen if the applied spot is lower than the level of
the developing liquid?
What will be the result of applying too much compound on a TLC
plate?
What is the reason that the mobile phase travels up the silica
gel plate (TLC plate)?
4. Determine the Rf value of the substances A, B, and Con the TLC shown. Show...
1. When 2-propanol was used as the developing solvent, two substances moved with the solvent front...
1. When 2-propanol was used as the developing solvent, two substances moved with the solvent front (Rf= 1) during TLC analysis on a silica gel plate. Can you conclude that they are identical? If not, what additional experiment(s) would you perform? 2. The Rf value of compound A is 0.34 when a TLC plate is developed in hexane and 0.44 when the plate is developed in diethyl ether. Compound B has an Rf value of 0.42 in hexane and 0.60...
4. Consider the following silica gel TLC plac or compounds A, B, and hexines: developed in...
4. Consider the following silica gel TLC plac or compounds A, B, and hexines: developed in Fo-o- og a) Determine the Rr values of compounds A, B, and C run on a silica gel TLC plate using hexanes as the solvent b) Which compound, A, B, or C. is the most polar? values if you used acetone instead c) What would you expect to happen to the of hexanes as the eluting solvent? 5) Consider a sample that is a...
* A student cools a sample in a capillary tube after melting it. Upon attempting to determine the melting point on...
* A student cools a sample in a capillary tube after melting it. Upon attempting to determine the melting point on the same sample, the stjudent does not obtain the same melting point. Why? . A student places his TLC plate in a chamber where the solvent level is higher than the starting line on the TLC. How does that affect the experiment? . A student leaves off the top of her TLC chamber. How will that affect her Rf...
Please help 2. Consider the TLC plate shown below that was done on silica gel using...
Please help
2. Consider the TLC plate shown below that was done on silica gel using a solvent mixture of 4:1 hexane/EtoAc as the eluent. 4:1 Hexane:EtOAC marked solvent front Spot B Spot A A origin (a) Which of the two organic compounds labeled A and B is less polar? (b) Calculate the Rf value of compound B. (c) How would the following changes affect the Rf values of A and B? i. Change to a more polar solvent mixture...
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...
can you please answer all 1. When you run a TLC of the reaction in ethyl...
can
you please answer all
1. When you run a TLC of the reaction in ethyl acetate : hexanes 1:1, the plate below is produced. Give a solvent system that would be expected to produce greater separation and a BRIEF (8 words) justification about your choice. (5 points) 7 6 5 4 3 b. Calculate the R for the bottom spot. (5 points) c. Which compound on the TLC plate is the most polar? (5 points) 2. Why is it...
C. Determining Rr Value for Non-Polar Solvent System The information from the above solvent syste...
CAN YOU PLEASE ANSWER AS SOON AS POSSIBLE THANK
YOU
C. Determining Rr Value for Non-Polar Solvent System The information from the above solvent systems (Part A) can be used to compare the relative polarities of different functional groups. Select the best solvent system above for the set of compounds in each test below to use for your comparisons. When you are done, use your work to list the functional groups in order of increasing polarity E + Solvent foballtut,...
Hi can someone help me with my pre lab theory questions (1,2,3) on rate of elution...
Hi can someone help me with my pre lab theory questions (1,2,3)
on rate of elution or Rf? Here is some background below. Please
help explain as many as possible (1-3)! I dont really get the
relation ships in this lab, thank you!
1. What factors affect the rate of elution in organic compounds? 2. Explain what is the relationship between polarities of compounds (polar/non- polar compound) and rate of elution (Rf). 3. Explain what is the relationship between solvent...
Didn't post this right the first time. Here is everything in full! Need help with Organic...
Didn't post this right the first time. Here is everything in
full!
Need help with Organic Chemistry, understanding the labs.
1. Soon you will synthesize the analgesic acetanilide in lab. It's me is 114°C. What does it indicate about your product if you obtain a mn of 103 - 112°C. Explain. acetanilide YO 2. Neither aniline nor nitrobenzene is particularly water soluble. However, one is completely soluble in dilute aqueous HCI. Which one is soluble, and explain why? (For maximum...
Determine the Rf value of the substances A, B, and C on the TLC
shown. Show your calculation!
What will happen if the applied spot is lower than the level of
the developing liquid?
What will be the result of applying too much compound on a TLC
plate?
What is the reason that the mobile phase travels up the silica
gel plate (TLC plate)?
4. Determine the Rf value of the substances A, B, and Con the TLC shown. Show...
1. When 2-propanol was used as the developing solvent, two substances moved with the solvent front (Rf= 1) during TLC analysis on a silica gel plate. Can you conclude that they are identical? If not, what additional experiment(s) would you perform? 2. The Rf value of compound A is 0.34 when a TLC plate is developed in hexane and 0.44 when the plate is developed in diethyl ether. Compound B has an Rf value of 0.42 in hexane and 0.60...
4. Consider the following silica gel TLC plac or compounds A, B, and hexines: developed in Fo-o- og a) Determine the Rr values of compounds A, B, and C run on a silica gel TLC plate using hexanes as the solvent b) Which compound, A, B, or C. is the most polar? values if you used acetone instead c) What would you expect to happen to the of hexanes as the eluting solvent? 5) Consider a sample that is a...
* A student cools a sample in a capillary tube after melting it. Upon attempting to determine the melting point on the same sample, the stjudent does not obtain the same melting point. Why? . A student places his TLC plate in a chamber where the solvent level is higher than the starting line on the TLC. How does that affect the experiment? . A student leaves off the top of her TLC chamber. How will that affect her Rf...
Please help
2. Consider the TLC plate shown below that was done on silica gel using a solvent mixture of 4:1 hexane/EtoAc as the eluent. 4:1 Hexane:EtOAC marked solvent front Spot B Spot A A origin (a) Which of the two organic compounds labeled A and B is less polar? (b) Calculate the Rf value of compound B. (c) How would the following changes affect the Rf values of A and B? i. Change to a more polar solvent mixture...
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...
can
you please answer all
1. When you run a TLC of the reaction in ethyl acetate : hexanes 1:1, the plate below is produced. Give a solvent system that would be expected to produce greater separation and a BRIEF (8 words) justification about your choice. (5 points) 7 6 5 4 3 b. Calculate the R for the bottom spot. (5 points) c. Which compound on the TLC plate is the most polar? (5 points) 2. Why is it...
CAN YOU PLEASE ANSWER AS SOON AS POSSIBLE THANK
YOU
C. Determining Rr Value for Non-Polar Solvent System The information from the above solvent systems (Part A) can be used to compare the relative polarities of different functional groups. Select the best solvent system above for the set of compounds in each test below to use for your comparisons. When you are done, use your work to list the functional groups in order of increasing polarity E + Solvent foballtut,...
Hi can someone help me with my pre lab theory questions (1,2,3)
on rate of elution or Rf? Here is some background below. Please
help explain as many as possible (1-3)! I dont really get the
relation ships in this lab, thank you!
1. What factors affect the rate of elution in organic compounds? 2. Explain what is the relationship between polarities of compounds (polar/non- polar compound) and rate of elution (Rf). 3. Explain what is the relationship between solvent...
Didn't post this right the first time. Here is everything in
full!
Need help with Organic Chemistry, understanding the labs.
1. Soon you will synthesize the analgesic acetanilide in lab. It's me is 114°C. What does it indicate about your product if you obtain a mn of 103 - 112°C. Explain. acetanilide YO 2. Neither aniline nor nitrobenzene is particularly water soluble. However, one is completely soluble in dilute aqueous HCI. Which one is soluble, and explain why? (For maximum...
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