Homework Answers
100% ethyl aectate is highly polar. If you use it to begin with, both the componds will move together and there will be no separation.
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A polar compound binds with the stationary phase which is silica. If we increase the polarity of the solvent, then the more polar compound will dissolve in it and move faster.
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Why would it be unwise to use 100% ethyl acetate as the first mobile phase you...
If acetaminophen is used in a TLC experiment with 100 % ethyl acetate as the solvent...
If acetaminophen is used in a TLC experiment with 100 % ethyl acetate as the solvent system, explain in terms of polarity why the spot would move fast or slow up the TLC plate?
1. When separating mixtures using TLC, why is it important to choose a solvent (mobile phase)...
1. When separating mixtures using TLC, why is it important to choose a solvent (mobile phase) that has a different polarity than the TLC plate (stationary phase)? 2. Why will some substances in a mixture travel farther up the TLC plate than others?
Huie Turva polar better with higher solvent stationary phase Study Problem: A mixture of organic compounds...
Huie Turva polar better with higher solvent stationary phase Study Problem: A mixture of organic compounds was analyzed by TLC using different solvent mixtures as mobile pha and the results are presented in the diagram below. Compare the TLC plates A-D with the one on the left and answer th questions: a) How is the polarity of the mobile phase used to TLC plate A comparative with plate on the left? b) How are the Ri's value on the plate...
If aspirin (acetylsalicylic acid) is used in a TLC experiment with 1:1 Hexanes / Ethyl acetate...
If aspirin (acetylsalicylic acid) is used in a TLC experiment with 1:1 Hexanes / Ethyl acetate as the solvent system, explain in terms of polarity why the spot would move fast or slow up the TLC plate?
A student monitored the reaction progress of the reduction of 4-Nitrobenzaldehyde to 4-Nitrobenzyl alcohol using TLC....
A student monitored the reaction progress of the reduction of
4-Nitrobenzaldehyde to 4-Nitrobenzyl alcohol using TLC. 30% ethyl
acetate in petroleum ether was used as the elution solvent. TLC
plates available in the laboratory were coated with the common
absorbent silica gel (SiO2.xH2O) which
contains polar hydroxyl (OH-) groups.
c. The crude product moves slower
than the starting material with the mobile
phase in the TLC plate. Briefly
explain a possible reason for the
observation based on the chemical
structures...
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...
Question 10 1 pts What hazard classification would you expect a 90% ethyl acetate/10% hexane mixture...
Question 10 1 pts What hazard classification would you expect a 90% ethyl acetate/10% hexane mixture to have? Flammable liquid Corrosive Toxic Flammable solid Question 16 1 pts The TLC diagram shown represents the analysis of three different compounds. Which of the three columns is/are likely to represent a pure compound, and why? 0 0 2 * 3 Columns 1 and 3, because there is only one spot in each. Column 2 only, because there are two spots present Columns...
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...
Common solvents used in TLC analysis are hexane and ethyl acetate, the latter being more polar. A TLC has been performed...
Common solvents used in TLC analysis are hexane and ethyl acetate, the latter being more polar. A TLC has been performed on a mixture of two compounds. The solvent ran for 3 cm(plate length is 6cm) with 5% ethyl acetate in hexane. The two spots were not resolved, meaning they showed up too close to each other. What can you suggest to possible improve the results of the separation?
Pre Lab Questions 1. Complete the following table: Compound Acetanilide (A) Benzophenone (B) Mandelic acid (C) Benzi...
Pre Lab Questions 1. Complete the following table: Compound Acetanilide (A) Benzophenone (B) Mandelic acid (C) Benzil (D) Benzoic acid (E) Structure Solubility in hexanes Solubility in ethyl acetate 2. Using the following diagram of a TLC plate, answer the following questions: solvent front a) Which compound is more polar if the stationary phase is silica gel? b) True or False: If the solvent mixture was made less polar, the compounds would move farther. c) Use a ruler and calculate...
1. When separating mixtures using TLC, why is it important to choose a solvent (mobile phase) that has a different polarity than the TLC plate (stationary phase)? 2. Why will some substances in a mixture travel farther up the TLC plate than others?
Huie Turva polar better with higher solvent stationary phase Study Problem: A mixture of organic compounds was analyzed by TLC using different solvent mixtures as mobile pha and the results are presented in the diagram below. Compare the TLC plates A-D with the one on the left and answer th questions: a) How is the polarity of the mobile phase used to TLC plate A comparative with plate on the left? b) How are the Ri's value on the plate...
A student monitored the reaction progress of the reduction of
4-Nitrobenzaldehyde to 4-Nitrobenzyl alcohol using TLC. 30% ethyl
acetate in petroleum ether was used as the elution solvent. TLC
plates available in the laboratory were coated with the common
absorbent silica gel (SiO2.xH2O) which
contains polar hydroxyl (OH-) groups.
c. The crude product moves slower
than the starting material with the mobile
phase in the TLC plate. Briefly
explain a possible reason for the
observation based on the chemical
structures...
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...
Question 10 1 pts What hazard classification would you expect a 90% ethyl acetate/10% hexane mixture to have? Flammable liquid Corrosive Toxic Flammable solid Question 16 1 pts The TLC diagram shown represents the analysis of three different compounds. Which of the three columns is/are likely to represent a pure compound, and why? 0 0 2 * 3 Columns 1 and 3, because there is only one spot in each. Column 2 only, because there are two spots present Columns...
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...
Pre Lab Questions 1. Complete the following table: Compound Acetanilide (A) Benzophenone (B) Mandelic acid (C) Benzil (D) Benzoic acid (E) Structure Solubility in hexanes Solubility in ethyl acetate 2. Using the following diagram of a TLC plate, answer the following questions: solvent front a) Which compound is more polar if the stationary phase is silica gel? b) True or False: If the solvent mixture was made less polar, the compounds would move farther. c) Use a ruler and calculate...
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