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Consider the following errors that could be made when running TLC. Indicate what should be done...
131% 14:11 PM X Question 5. Consider the following errors that could be made when runng...
131% 14:11 PM X Question 5. Consider the following errors that could be made when runng TLC. Indicate what should be done to cormect the error a) A two-component mixture containing 1-octene and 1, 4-dimethylbenzene gave only one spot with an Re vlue of 0.95. The solvent used was hexane. When alTLC plate was developed, the solvent front ran off the top of the plate. b)
1. The following chromatogram contained three samples before their development: sample A, sample B and sample...
1. The following chromatogram contained three samples before their development: sample A, sample B and sample C. After visualization of the plate with ultraviolet light, the plotting of the contours of the spots on the chromatogram is ndicated below. Write down all the conclusions that derived from this chromatographic analysis regarding the nature of fractions A, B and C. Determine each value of the retention fronts and use them as one of the main criteria for be 2. Consider the...
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. 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...
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...
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...
I need help with my pre and post lab questions. The three compounds below were spotted...
I need help with my pre and post lab questions.
The three compounds below were spotted on a TLC plate and developed to give the TLC plate shown. Which compound corresponds to which spot? Calculate the Rf value for spot B in the TLC plate shown above. When using polarity to determine the relative rates at which organic compounds travel up the TLC plate, we are considering compounds of similar molecular weight. It should also be noted that Rf values...
please do two pargraph about this pre lab and lab include Title,purpose ,chemical eqution if their...
please do two pargraph about this pre lab and lab include
Title,purpose ,chemical eqution if their any ،Procedure
,Hazards(hazard Identification,physical and chemical
properties),Experimental Phase, Data
&Observations,Data&Observations cont (melting point and
meling point). and Calcuations
Spinach Laboratory Procedure PROCEDURES Isolation of pigment from leaves: 1. Wash the spinach leaves. Weigh 1.0 g-2.0 g of dry spinach leaves. Remove any stems and veins from the leaves before you weigh. 2. Combine 1.0 g of anhydrous magnesium sulfate with 0.5 g of sand...
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...
131% 14:11 PM X Question 5. Consider the following errors that could be made when runng TLC. Indicate what should be done to cormect the error a) A two-component mixture containing 1-octene and 1, 4-dimethylbenzene gave only one spot with an Re vlue of 0.95. The solvent used was hexane. When alTLC plate was developed, the solvent front ran off the top of the plate. b)
1. The following chromatogram contained three samples before their development: sample A, sample B and sample C. After visualization of the plate with ultraviolet light, the plotting of the contours of the spots on the chromatogram is ndicated below. Write down all the conclusions that derived from this chromatographic analysis regarding the nature of fractions A, B and C. Determine each value of the retention fronts and use them as one of the main criteria for be 2. Consider the...
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. 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...
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...
I need help with my pre and post lab questions.
The three compounds below were spotted on a TLC plate and developed to give the TLC plate shown. Which compound corresponds to which spot? Calculate the Rf value for spot B in the TLC plate shown above. When using polarity to determine the relative rates at which organic compounds travel up the TLC plate, we are considering compounds of similar molecular weight. It should also be noted that Rf values...
please do two pargraph about this pre lab and lab include
Title,purpose ,chemical eqution if their any ،Procedure
,Hazards(hazard Identification,physical and chemical
properties),Experimental Phase, Data
&Observations,Data&Observations cont (melting point and
meling point). and Calcuations
Spinach Laboratory Procedure PROCEDURES Isolation of pigment from leaves: 1. Wash the spinach leaves. Weigh 1.0 g-2.0 g of dry spinach leaves. Remove any stems and veins from the leaves before you weigh. 2. Combine 1.0 g of anhydrous magnesium sulfate with 0.5 g of sand...
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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