Homework Answers
Reversed-phase HPLC- the order of elution is opposite to that in a normal-phase separation, with more polar solutes elute first. polarity rankis below
Amide > Acid > Alcohol > Ketone ~ Aldehyde > Amine > Ester > Ether > Alkane
in our case we have Benzioc acid > Benzyl alcohol > Acetophenone ~ Benzaldehyde
In reversed-phase chromatography using Polar (aq) mobile phase,hydrophobic (water repelent) molecules in the polar mobile phase tend to adsorb to the hydrophobic stationary phase, and hydrophilic (water lover) molecules in the mobile phase will pass through the column and are eluted first.i.e Mobile phase is polar and stationary phase is non polar.
Due to this non polar compound elute with low rate while polar elute first.
so elution in reverse phase HPLC will be in oreder of first benzoic acid then benzyl alcohol then benzaldehyde then acetophenone (due to steric effect of methyl proton.
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4) (10 pts) What is the order of elution of the following compounds from a reverse-phase...
4) What is the order of elution of the following compounds from a reverse-phase packed HPLC...
4) What is the order of elution of the following compounds from a reverse-phase packed HPLC column? Briefly justify your reasoning. Benzyl alcohol (C6H5CH2OH), benzaldehyde (C6H5CHO), benzoic acid (C6H5COOH), Acetophenone (C6H5C(O)CH3)
7. Given a non-polar stationary phase C18 (reverse phase) and a slightly polar mobile phase (15%...
7. Given a non-polar stationary phase C18 (reverse phase) and a slightly polar mobile phase (15% water 85% acetonitrile) predict the order of elution for the following compounds (with 1 being the fastest and 4 being the slowest) (6 pts) Methanol CH OH 1-florobutane CH CH CH2CH2F Butanol CH,CH CHCHOH Cyclohexane CoH12 Briefly justify how you made your choice(s) Now increase the polarity of the mobile phase to 85% water and 15 % acetonitrile. Explain the relative shifts in retention...
question 6/10 Give the order of elution of the following compounds using reversed-phase partition chromatography at...
question 6/10
Give the order of elution of the following compounds using reversed-phase partition chromatography at pH 8. Briefly explain.
Put the analytes in order of increasing hydrophobicity. Which of the compounds is most hydrophilic? Which...
Put the analytes in order of increasing hydrophobicity. Which of
the compounds is most hydrophilic? Which is most hydrophobic? What
is the predicted elution order from a reverse phase chromatography
column?
a. acetophenone b. benzophenone c. butylparaben d. propiopheneone e. ethylparaben f. propylparaben g. ketoprofen h. 3-nitrophenol i. 4-nitrophenol 2. Put the analytes in order of increasing hydrophobicity. Which of the compounds is most hydrophilic? Which is most hydrophobic? What is the predicted elution order from a reverse phase chromatography...
8.2 Rank the following solvents in order of increasing polarity: dichloromethane, acetic acid, methanol, and diethyl...
8.2 Rank the following solvents in order of increasing polarity: dichloromethane, acetic acid, methanol, and diethyl ether. (Hint: refer to Appendices 1 and 3). 8.3 Rank the following compounds in the order in which they would elute off an alumina column: benzoic acid, benzene, benzaldehyde, and benzyl alcohol. S
question #2 please Reverse phase chromatography is the most common type of liquid chromatography which the...
question #2 please
Reverse phase chromatography is the most common type of liquid chromatography which the solid phase is made up of a packing material that is largely hydrophobic and the eluents are of varying polarities. In general, the more polar compounds elute first from the column followed by more hydrophobic compounds. PRELAB QUESTIONS 1. Draw structures for the following analytes for the simulation: a. acetophenone b. benzophenone c. butylparaben d. propiopheneone e. ethylparaben f. propylparaben g. ketoprofen h. 3-nitrophenol...
PLEASE ANSWER ASAP 4. Suggest an efficient synthesis of each of the following compounds, starting from...
PLEASE ANSWER ASAP
4. Suggest an efficient synthesis of each of the following compounds, starting from the compound indicated and any other needed reagents and solvents. (72 pts) (a) 2-pentanol, from 1-chloropropane (b) 2-butanone, from 2-butanol (c) 1,3,5-tribromobenzene, from benzene (d) benzoic acid, from chlorobenzene (e) benzyl tert-butyl ether (C6H3CH2OC(CH3)3, from benzyl alcohol and tert-butyl alcohol (1) acetyl chloride, from ethanol
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,...
What is the order in which the following compounds (acetone, 1,2-dichloroethane, acetamide) would be eluted from...
What is the order in which the following compounds (acetone, 1,2-dichloroethane, acetamide) would be eluted from an HPLC column containing a reversed-phase (RP) stationary? dichloroethane < acetone<acetamide acetamide <dichloroethane acetone acetone<acetamide <dichloroethane acetamide <acetone<dichloroethane
1. Select an appropriate type of column for separating these steroids and give the rationale for...
1. Select an appropriate type of column for separating these steroids and give the rationale for your selection. HO HO ОН OH Prednisolone Prednisone 2. You are using a C18 Reverse Phase column and the parameters shown below to separate Acetaminophen, Caffeine, and Benzoic Acid. You observe three peaks in your chromatogram (Huzzah!). Which corresponds to which compound? Explain the rationale behind your assignment. OH C18 REVERSED PHASE COLUMN Acetaminophen HC N H, O Caffeine Column: Legacy L1 Size: 4.6...
7. Given a non-polar stationary phase C18 (reverse phase) and a slightly polar mobile phase (15% water 85% acetonitrile) predict the order of elution for the following compounds (with 1 being the fastest and 4 being the slowest) (6 pts) Methanol CH OH 1-florobutane CH CH CH2CH2F Butanol CH,CH CHCHOH Cyclohexane CoH12 Briefly justify how you made your choice(s) Now increase the polarity of the mobile phase to 85% water and 15 % acetonitrile. Explain the relative shifts in retention...
question 6/10
Give the order of elution of the following compounds using reversed-phase partition chromatography at pH 8. Briefly explain.
Put the analytes in order of increasing hydrophobicity. Which of
the compounds is most hydrophilic? Which is most hydrophobic? What
is the predicted elution order from a reverse phase chromatography
column?
a. acetophenone b. benzophenone c. butylparaben d. propiopheneone e. ethylparaben f. propylparaben g. ketoprofen h. 3-nitrophenol i. 4-nitrophenol 2. Put the analytes in order of increasing hydrophobicity. Which of the compounds is most hydrophilic? Which is most hydrophobic? What is the predicted elution order from a reverse phase chromatography...
8.2 Rank the following solvents in order of increasing polarity: dichloromethane, acetic acid, methanol, and diethyl ether. (Hint: refer to Appendices 1 and 3). 8.3 Rank the following compounds in the order in which they would elute off an alumina column: benzoic acid, benzene, benzaldehyde, and benzyl alcohol. S
question #2 please
Reverse phase chromatography is the most common type of liquid chromatography which the solid phase is made up of a packing material that is largely hydrophobic and the eluents are of varying polarities. In general, the more polar compounds elute first from the column followed by more hydrophobic compounds. PRELAB QUESTIONS 1. Draw structures for the following analytes for the simulation: a. acetophenone b. benzophenone c. butylparaben d. propiopheneone e. ethylparaben f. propylparaben g. ketoprofen h. 3-nitrophenol...
PLEASE ANSWER ASAP
4. Suggest an efficient synthesis of each of the following compounds, starting from the compound indicated and any other needed reagents and solvents. (72 pts) (a) 2-pentanol, from 1-chloropropane (b) 2-butanone, from 2-butanol (c) 1,3,5-tribromobenzene, from benzene (d) benzoic acid, from chlorobenzene (e) benzyl tert-butyl ether (C6H3CH2OC(CH3)3, from benzyl alcohol and tert-butyl alcohol (1) acetyl chloride, from ethanol
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,...
What is the order in which the following compounds (acetone, 1,2-dichloroethane, acetamide) would be eluted from an HPLC column containing a reversed-phase (RP) stationary? dichloroethane < acetone<acetamide acetamide <dichloroethane acetone acetone<acetamide <dichloroethane acetamide <acetone<dichloroethane
1. Select an appropriate type of column for separating these steroids and give the rationale for your selection. HO HO ОН OH Prednisolone Prednisone 2. You are using a C18 Reverse Phase column and the parameters shown below to separate Acetaminophen, Caffeine, and Benzoic Acid. You observe three peaks in your chromatogram (Huzzah!). Which corresponds to which compound? Explain the rationale behind your assignment. OH C18 REVERSED PHASE COLUMN Acetaminophen HC N H, O Caffeine Column: Legacy L1 Size: 4.6...
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