Homework Answers
Solution:
The two factors which can improve the separation of two peaks are:
A) Reduce the injection time:
Reducing injection time will causes a separation of both peaks.
B) Reducing the sample size:
Reduction in sample size will be helpful in the separation of peaks.
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4. A GC sample of a mixture of two compounds produces a single peak in the...
4. The compounds in a mixture separated by GC can be identified by their retention times....
4. The compounds in a mixture separated by GC can be identified by their retention times. If you Suructor nad not told you which peak in the GC chromatogram corresponded to which alker you didn't know the boiling points of the alkenes, how could you determine the identity or each peak by its retention time? Identities of the components in a mixture separated by GC can also be determined by the technique called "spiking". Suppose you had run a chromatogram...
2. A solution containing a mixture of naphthalene, benzoic acid, and benzaldehyde is analyzed via TLC...
2. A solution containing a mixture of naphthalene, benzoic acid, and benzaldehyde is analyzed via TLC and GC. Use the structures and properties of the compounds to aid in answering the following questions. A. In the TLC experiment, the mixture is spotted on a silica TLC plate and eluted with a 1:1 mixture of hexanes and ethyl acetate. Three spots are observed on the plate, with Re values of 0.25, 0.58, and 0.74. Indicate which spot corresponds to which compound....
4. The following is the GC spectrum of a student's cyclohexene sample from Experiment 9. Refer...
4. The following is the GC spectrum of a student's cyclohexene sample from Experiment 9. Refer to the lab manual for more information concerning the preparation of the GC sample. Three peaks corresponding to diethyl ether (2.668 min), cyclohexene (2.928 min) and cyclohexanol (3.763 min) are shown in the spectrum. Their peak areas are listed in the table below. (a) If the reported yield of the reaction is 3 g, estimate the actual yield of the cyclohexene. Ignore the difference...
9 VII. Gas Chromatography 1. The organic mixture to be separated on the GC is injected...
9 VII. Gas Chromatography 1. The organic mixture to be separated on the GC is injected into the GC as a (gas, liquid, or solid). 2. The typical volume of mixture injected into a GC is 1-10 (microliters, milliliters, or deciliters). 3. Immediately upon entering the injection port the mixture is_ _(solidified, condensed, or vaporized). (heated, cooled, maintained at room 4. The event described in #3 occurs because the injection port is temperature). 5. An inert gas, referred to as...
Table 2: Alcohol and Ketone Standards GC Retention Times GC#: Retention time Alcohol Standard Mixture Phent...
Table 2: Alcohol and Ketone Standards GC Retention Times GC#: Retention time Alcohol Standard Mixture Phent ion= 2.05Smin low Peak 1 Compound Name: athanol Rapesnal utanal aclapeatanal 4.755min oilng 6.895min .230 min Peak 2 Compound Name: Peak 3 Compound Name: Peak 4 Compound Name: GC#:1 Ketone Standard Mixture Retention time 2.575un Peak 1 Compound Name: Acclono Butanon a Pentanone 2tHex anon Peak 2 Compound Name: min Peak 3 Compound Name: 615 min 1D. 307 min Peak 4 Compound Name: Part...
Experiment 4 Analysis of the Chromatograms lelentian Time/ Velention Time Area EtOAc: Area BuOAc Peak area...
Experiment 4 Analysis of the Chromatograms lelentian Time/ Velention Time Area EtOAc: Area BuOAc Peak area EtOAc Peak area BuOAc Acetate Mixture 1.98/340-70 4.59/197-K 1./31.22 |5.58s&-08 1.01/39.945545/23212 5.975 n747 1t fraction 2nd fraction 3rd fraction N/A 4th fraction 5th-fraction DATA ANALYSIS 1. Based on the distillation and GC data, what was the ethyl acetate:butyl acetate ratio for each fraction? 2. How well did your fractionating column separate the chemicals? What could you change to achieve better separation? to oo
Experiment...
1. if you were to see a peak in your GC-MS sample with a retention time...
1. if you were to see a peak in your GC-MS sample with a retention time of 8.00 min, how would the polarity of that compound compare to the polarity of limonene? Explain. 2. what is the purpose of adding the anhydrous sodium sulfate to GC-MS vial and filtering it? what might happen during the GC-MS analysis if we didn’t perform these steps?
Gas Chromatography Analysis: Please interpret the set of GC data below. This set of data consists...
Gas Chromatography Analysis:
Please interpret the set of GC data below. This set of data consists of a mixture of three compounds (3-methylbutan-1-ol, hexanal, and cyclopentanone shown in the lab manual) that have similar boiling points. There is a gas chromatogram of the mixture and gas chromatograms of the individual compounds for peak identification by retention time. You will answer the following questions based on this data set: 1. Was our gas chromatograph able to separate three compounds with similar...
5. Using the GC mentioned in question 4 and the values listed on the chromatogram for...
5. Using the GC mentioned in question 4 and the values listed on the chromatogram for the height and width (at half height) of each peak, calculate the percent composition for each product (A, B and C). Be sure to show your work. (8 points) 6. The products corresponding to each peak on the GC are the ortho, meta, and para isomers of the nitrated product shown in the scheme for reaction 1. These isomers were isolated, and a proton...
The goal of this experiment is to separate a mixture of two unknown compounds into individual...
The goal of this experiment is to separate a mixture of two unknown compounds into individual Components and to identify the compounds. Answer the questions below. More than one answer may be possible. Why do we need to be especially careful when working with diethyl ether? Fumes can cause drowsiness & dizziness, and in high concentration, loss of consciousness Because it is highly acidic and can burn the skin Because it is extremely volatile and flammable. Of all of the...
4. The compounds in a mixture separated by GC can be identified by their retention times. If you Suructor nad not told you which peak in the GC chromatogram corresponded to which alker you didn't know the boiling points of the alkenes, how could you determine the identity or each peak by its retention time? Identities of the components in a mixture separated by GC can also be determined by the technique called "spiking". Suppose you had run a chromatogram...
2. A solution containing a mixture of naphthalene, benzoic acid, and benzaldehyde is analyzed via TLC and GC. Use the structures and properties of the compounds to aid in answering the following questions. A. In the TLC experiment, the mixture is spotted on a silica TLC plate and eluted with a 1:1 mixture of hexanes and ethyl acetate. Three spots are observed on the plate, with Re values of 0.25, 0.58, and 0.74. Indicate which spot corresponds to which compound....
4. The following is the GC spectrum of a student's cyclohexene sample from Experiment 9. Refer to the lab manual for more information concerning the preparation of the GC sample. Three peaks corresponding to diethyl ether (2.668 min), cyclohexene (2.928 min) and cyclohexanol (3.763 min) are shown in the spectrum. Their peak areas are listed in the table below. (a) If the reported yield of the reaction is 3 g, estimate the actual yield of the cyclohexene. Ignore the difference...
9 VII. Gas Chromatography 1. The organic mixture to be separated on the GC is injected into the GC as a (gas, liquid, or solid). 2. The typical volume of mixture injected into a GC is 1-10 (microliters, milliliters, or deciliters). 3. Immediately upon entering the injection port the mixture is_ _(solidified, condensed, or vaporized). (heated, cooled, maintained at room 4. The event described in #3 occurs because the injection port is temperature). 5. An inert gas, referred to as...
Table 2: Alcohol and Ketone Standards GC Retention Times GC#: Retention time Alcohol Standard Mixture Phent ion= 2.05Smin low Peak 1 Compound Name: athanol Rapesnal utanal aclapeatanal 4.755min oilng 6.895min .230 min Peak 2 Compound Name: Peak 3 Compound Name: Peak 4 Compound Name: GC#:1 Ketone Standard Mixture Retention time 2.575un Peak 1 Compound Name: Acclono Butanon a Pentanone 2tHex anon Peak 2 Compound Name: min Peak 3 Compound Name: 615 min 1D. 307 min Peak 4 Compound Name: Part...
Experiment 4 Analysis of the Chromatograms lelentian Time/ Velention Time Area EtOAc: Area BuOAc Peak area EtOAc Peak area BuOAc Acetate Mixture 1.98/340-70 4.59/197-K 1./31.22 |5.58s&-08 1.01/39.945545/23212 5.975 n747 1t fraction 2nd fraction 3rd fraction N/A 4th fraction 5th-fraction DATA ANALYSIS 1. Based on the distillation and GC data, what was the ethyl acetate:butyl acetate ratio for each fraction? 2. How well did your fractionating column separate the chemicals? What could you change to achieve better separation? to oo
Experiment...
Gas Chromatography Analysis:
Please interpret the set of GC data below. This set of data consists of a mixture of three compounds (3-methylbutan-1-ol, hexanal, and cyclopentanone shown in the lab manual) that have similar boiling points. There is a gas chromatogram of the mixture and gas chromatograms of the individual compounds for peak identification by retention time. You will answer the following questions based on this data set: 1. Was our gas chromatograph able to separate three compounds with similar...
5. Using the GC mentioned in question 4 and the values listed on the chromatogram for the height and width (at half height) of each peak, calculate the percent composition for each product (A, B and C). Be sure to show your work. (8 points) 6. The products corresponding to each peak on the GC are the ortho, meta, and para isomers of the nitrated product shown in the scheme for reaction 1. These isomers were isolated, and a proton...
The goal of this experiment is to separate a mixture of two unknown compounds into individual Components and to identify the compounds. Answer the questions below. More than one answer may be possible. Why do we need to be especially careful when working with diethyl ether? Fumes can cause drowsiness & dizziness, and in high concentration, loss of consciousness Because it is highly acidic and can burn the skin Because it is extremely volatile and flammable. Of all of the...
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