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What is the order in which the following compounds (acetone, 1,2-dichloroethane, acetamide) would be eluted from...
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)
4) (10 pts) What is the order of elution of the following compounds from a reverse-phase...
4) (10 pts) What is the order of elution of the following compounds from a reverse-phase packed HPLC column? Briefly justify your reasoning. Benzyl alcohol (C.HSCH-OH), benzaldehyde (C6HSCHO), benzoic acid (C6HCOOH), Acetophenone (C6H5C(O)CH3)
(a) In what order do you expect the following species to be eluted in normal-phase LC?...
(a) In what order do you expect the following species to be eluted in normal-phase LC? Indicate with numbers and provide brief rationale: 0₂N NO₂ NO2 trinitrotoluene 1-heptene heptane heptane phenol toluene (b) Fraction of which component of the mobile phase should be increased when a hexane/acetone gradient is employed to facilitate elution of phenol and trinitrotoluene? Provide brief rationale
(a) In what order do you expect the following species to be eluted in normal-phase LC?...
(a) In what order do you expect the following species to be eluted in normal-phase LC? Indicate with numbers and provide brief rationale: 0₂N NO₂ NO2 trinitrotoluene 1-heptene heptane heptane phenol toluene (b) Fraction of which component of the mobile phase should be increased when a hexane/acetone gradient is employed to facilitate elution of phenol and trinitrotoluene? Provide brief rationale
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...
Chromatography Basics Multiple Choice: Answer the following multiple choice questions about Chromatography Basics (SHOW WORKING): 1) In...
Chromatography Basics Multiple Choice: Answer the following multiple choice questions about Chromatography Basics (SHOW WORKING): 1) In a given chromatographic column, A) different solutes behave as if there are a different number of theoretical plates for each. B) the number of theoretical plates is the same for all solutes. C) efficiency is improved by increasing plate height. 2) What useful information can be found from a Van Deemter plot? A) The selectivity factor B) Optimum mobile phase flow rate C) Optimum...
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...
What is the main purpose of running a column chromatography? Similar to TLC. column chromatography is...
What is the main purpose of running a column chromatography? Similar to TLC. column chromatography is based on analytes being partitioned between a stationary phase (not moving) and a mobile phase (moving). What is most commonly used as stationary phase in a column? Is this material polar or non-polar? In this experiment, you will use different solvents to run column chromatography separation of different pigments extracted from spinach leaves. These solvents are a mixture of acetone and hexanes. (a) What...
Name: Hand this in for prelab assignment for the second week of this experiment (There is...
Name: Hand this in for prelab assignment for the second week of this experiment (There is no prelab assignment for the first week). 1. What is a Friedel-Crafts acylation and what is its general mechanism? 2. Consider a sample containing ferrocene, monoacetylferrocene, and diacetylferrocene. Draw what a developed TLC plate spotted with this mixture is most probably to look like and identify which spot is which (assume you use methylene chloride as the developing solvent). Give a one sentence definition...
Briefly explain how chromatography technique works. What type of chromatography is being used in this lab...
Briefly explain how chromatography technique works. What type of chromatography is being used in this lab activity? ___________________________________________________ __________________________________ What are the mobile phase and stationary phase substances/Compounds, which are used in this experiment? Briefly explain the purpose of each phase. ____________________________ ______________________________________ If the following mix of molecules were purified using size exclusion chromatography, what would be the order in which the molecules pass through the opening in the bottom of the column? Mixture containing: Hemoglobin, 65,000 Daltons; Ribonuclease...
4) (10 pts) What is the order of elution of the following compounds from a reverse-phase packed HPLC column? Briefly justify your reasoning. Benzyl alcohol (C.HSCH-OH), benzaldehyde (C6HSCHO), benzoic acid (C6HCOOH), Acetophenone (C6H5C(O)CH3)
(a) In what order do you expect the following species to be eluted in normal-phase LC? Indicate with numbers and provide brief rationale: 0₂N NO₂ NO2 trinitrotoluene 1-heptene heptane heptane phenol toluene (b) Fraction of which component of the mobile phase should be increased when a hexane/acetone gradient is employed to facilitate elution of phenol and trinitrotoluene? Provide brief rationale
(a) In what order do you expect the following species to be eluted in normal-phase LC? Indicate with numbers and provide brief rationale: 0₂N NO₂ NO2 trinitrotoluene 1-heptene heptane heptane phenol toluene (b) Fraction of which component of the mobile phase should be increased when a hexane/acetone gradient is employed to facilitate elution of phenol and trinitrotoluene? Provide brief rationale
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...
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...
What is the main purpose of running a column chromatography? Similar to TLC. column chromatography is based on analytes being partitioned between a stationary phase (not moving) and a mobile phase (moving). What is most commonly used as stationary phase in a column? Is this material polar or non-polar? In this experiment, you will use different solvents to run column chromatography separation of different pigments extracted from spinach leaves. These solvents are a mixture of acetone and hexanes. (a) What...
Name: Hand this in for prelab assignment for the second week of this experiment (There is no prelab assignment for the first week). 1. What is a Friedel-Crafts acylation and what is its general mechanism? 2. Consider a sample containing ferrocene, monoacetylferrocene, and diacetylferrocene. Draw what a developed TLC plate spotted with this mixture is most probably to look like and identify which spot is which (assume you use methylene chloride as the developing solvent). Give a one sentence definition...
Briefly explain how chromatography technique works. What type of chromatography is being used in this lab activity? ___________________________________________________ __________________________________ What are the mobile phase and stationary phase substances/Compounds, which are used in this experiment? Briefly explain the purpose of each phase. ____________________________ ______________________________________ If the following mix of molecules were purified using size exclusion chromatography, what would be the order in which the molecules pass through the opening in the bottom of the column? Mixture containing: Hemoglobin, 65,000 Daltons; Ribonuclease...
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