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Please help with 2 and 3
1. What factors affect the rate of elution in organic...
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...
i just need help with 2 & 3 & 4. please explain and help 8. Rf...
i just need help with 2 & 3 & 4. please explain and
help
8. Rf value of compound on a TLC plate: h. "Like dissolves like" 2. What does one achieve by doing Thin Layer Chromatography or a column chromatography on a mixture of organic compounds? o 3. What is the basis of separation of two or more organic compounds when they are subjected to TLC? ano 4. Unexpected result: Why do you think the elution sequence of 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...
Hi can someone help me with question 2? It deals with Rf values and the collected...
Hi can someone help me with question 2? It deals with Rf values
and the collected data is given below!
Results: Rf Values Of Compounds In Solvents Solvents 100% 50% hexanes 75% hexanes 25% ethyl 100% ethyl Hexane 25% hexanes 75% ethyl acetate 50% ethyl Compounds acetate acetate acetate trans-Stilbene 0.125 0.419 0.781 0.594 0.906 9-Fluorenone 0.156 0.677 0.906 0.375 0.843 Benzoic Acid 0.094 0.742 0.813 0.656 0.937 #2.) For each of the solvents used, rank the compounds (trans-stilbene, 9-fluorenone,...
A.) What factors cause the order of elution to change? B.) If two unknown compounds are...
A.) What factors cause the order of elution to change? B.) If two unknown compounds are analyzed via thin-layer chromatography first using pure petroleum ether as the eluant and then 75:25 petroleum ether-ethyl acetate, how will the Rf values between plates change or can you not tell with the given information?
Which of the following statements regarding thin layer chromatography are TRUE? Partition chromatography separates compounds based...
Which of the following statements regarding thin layer chromatography are TRUE? Partition chromatography separates compounds based on how they distribute themselves between the stationary and mobile phases. In thin layer chromatography, a polar organic compound will be attracted to the adsorbent and therefore travel further up the plate than a non-polar compound The Rf value is independent of the adsorbent material used. In thin layer chromatography, a polar organic compound will be repelled by the adsorbent and therefore travel not...
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...
looking for a check of my work, is this correct? if not please let me know....
looking for a check of my work, is this correct? if not please
let me know. thanks!
1. (23 Total Points) Gas Chromatography a. (5 pts) Circle the BEST answer for the question below. Of the compounds listed below, which would you expect to eluto last from a nonpolar gas chromatographic column? 3 • n-Propanol (CH3CH2CH2OH) Polar Polar = 7* (mPoland 1. Methanol (CH3OH) Polar NON-Polar = 2nd 4. n-Butanol (CH3CH2CH2CH2OH) ВР 1st Low C . n-Pentanol (CH3CH2CH2CH2CH2OH) and Higher...
Hi can someone please help with question #1. It deals with Rf values and the data...
Hi can someone please help with question #1. It deals with Rf
values and the data collected is given below!
Results: Rf Values Of Compounds In Solvents Solvents 100% 50% hexanes 75% hexanes 25% ethyl 100% ethyl Hexane 25% hexanes 75% ethyl acetate 50% ethyl Compounds acetate acetate acetate trans-Stilbene 0.125 0.419 0.781 0.594 0.906 9-Fluorenone 0.156 0.677 0.906 0.375 0.843 Benzoic Acid 0.094 0.742 0.813 0.656 0.937 # 1. A solvent that gives a high Rf value is said...
help with this please!! 6 Florene Report E2. QUESTIONS, 9 points 1. In a different oxidation...
help with this please!!
6 Florene Report E2. QUESTIONS, 9 points 1. In a different oxidation reaction isobomool is converted to camphor with a solution of bleach (NaOCI) and acetic acid. The reaction is worked up using liquid-liquid extraction of compounds and analyzed by TLC. Identify which solvent layer in a separatory funnel each compound will be the most soluble by putting (A) Aqueous or (O) Organic under each compound below. 3 pts isoborneol bornylene camphor bleach sodium cetate -...
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...
i just need help with 2 & 3 & 4. please explain and
help
8. Rf value of compound on a TLC plate: h. "Like dissolves like" 2. What does one achieve by doing Thin Layer Chromatography or a column chromatography on a mixture of organic compounds? o 3. What is the basis of separation of two or more organic compounds when they are subjected to TLC? ano 4. Unexpected result: Why do you think the elution sequence of 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...
Hi can someone help me with question 2? It deals with Rf values
and the collected data is given below!
Results: Rf Values Of Compounds In Solvents Solvents 100% 50% hexanes 75% hexanes 25% ethyl 100% ethyl Hexane 25% hexanes 75% ethyl acetate 50% ethyl Compounds acetate acetate acetate trans-Stilbene 0.125 0.419 0.781 0.594 0.906 9-Fluorenone 0.156 0.677 0.906 0.375 0.843 Benzoic Acid 0.094 0.742 0.813 0.656 0.937 #2.) For each of the solvents used, rank the compounds (trans-stilbene, 9-fluorenone,...
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...
looking for a check of my work, is this correct? if not please
let me know. thanks!
1. (23 Total Points) Gas Chromatography a. (5 pts) Circle the BEST answer for the question below. Of the compounds listed below, which would you expect to eluto last from a nonpolar gas chromatographic column? 3 • n-Propanol (CH3CH2CH2OH) Polar Polar = 7* (mPoland 1. Methanol (CH3OH) Polar NON-Polar = 2nd 4. n-Butanol (CH3CH2CH2CH2OH) ВР 1st Low C . n-Pentanol (CH3CH2CH2CH2CH2OH) and Higher...
Hi can someone please help with question #1. It deals with Rf
values and the data collected is given below!
Results: Rf Values Of Compounds In Solvents Solvents 100% 50% hexanes 75% hexanes 25% ethyl 100% ethyl Hexane 25% hexanes 75% ethyl acetate 50% ethyl Compounds acetate acetate acetate trans-Stilbene 0.125 0.419 0.781 0.594 0.906 9-Fluorenone 0.156 0.677 0.906 0.375 0.843 Benzoic Acid 0.094 0.742 0.813 0.656 0.937 # 1. A solvent that gives a high Rf value is said...
help with this please!!
6 Florene Report E2. QUESTIONS, 9 points 1. In a different oxidation reaction isobomool is converted to camphor with a solution of bleach (NaOCI) and acetic acid. The reaction is worked up using liquid-liquid extraction of compounds and analyzed by TLC. Identify which solvent layer in a separatory funnel each compound will be the most soluble by putting (A) Aqueous or (O) Organic under each compound below. 3 pts isoborneol bornylene camphor bleach sodium cetate -...
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