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The table contains data for a liquid chromatography separation of four compounds, A, B, C, and...
Consider the data below for a liquid chromatography separation of four compounds, A, B, C, and...
Consider the data below for a liquid chromatography separation of four compounds, A, B, C, and D on a 45.0 cm column. Calculate the number of theoretical plates, N, for each peak. Retention Width at the Time (min) Base (min) 5.24 0.424 Number Number 12.8 1.08 NA = II 14.2 1.12 D 24.1 1.85 Number Number NB = 10 N= What is the average number of theoretical plates, Navg, for the column? Number Navy = avg What is the plate...
EXERCISE 6: Two chemical species, A and B are separated by isothermal gas chromatography, using a...
EXERCISE 6: Two chemical species, A and B are separated by isothermal gas chromatography, using a 2.00 m column having 5000 theoretical plates at a flow rate of 15.0 ml / min. The peak of unabsorbed air appears after 30 s; the peak of A appears after 5 min and that of B after 12 min (a) Calculate the dead volume VM of the column, and the retention volumes Va and VB. (b) Calculate the reduced volumes V’a and V'B...
Consider a separation performed on a 45.0 mm long open tubular column with a 0.50 mm...
Consider a separation performed on a 45.0 mm long open tubular column with a 0.50 mm diameter, and a 2.0 um thick stationary phase. Compound A eluted at 12.41 min, compound B eluted at 13.34 min, and the unretained solvent eluted at 1.130 min. What are the adjusted retention times, t, and retention factors, k, for compounds A and B? Number Number min Number Number min rB What is the relative retention, a, for this separation? Number roll down to...
Two compounds C and D are separated on a column 34 cm long . Given the...
Two compounds C and D are separated on a column 34 cm long . Given the chromatographic data below calculate The column resolution? , the number of theoretical plates ?the height of theoretical plate and what length of column would be required to give a resolution of 1.5? Compound C retention time 18.3 width at base of peak(min) = 2.18 Compound D retention time 17.7, width at base 1.23
A student researcher performed a chromatographic separation of caffeine and aspartame. The retention time for caffeine,...
A student researcher performed a chromatographic separation of caffeine and aspartame. The retention time for caffeine, is, was found to be 218.0 s with a baseline peak width, wc, of 14.4 s. The retention time for aspartame, 1., was 250.5 s with a baseline peak width, w of 21.1 s. The retention time for the unretained solvent methanol was 40.4 s. Calculate the average plate height, H, in micrometers for this separation, given that it was performed on a 27.7...
3. a) b) c) How many theoretical plates produce a chromatography peak eluting at 4.78 min...
3. a) b) c) How many theoretical plates produce a chromatography peak eluting at 4.78 min with a full width at half max (FWHM) of 1.20 s? The length of the column is 30.0 m. What is the plate height in microns? What is the peak resolution for this peak and another peak eluted at 4.73 minutes that has a full peak width (measured at the base) of 2.14 seconds? Is this sufficient for quantitative analysis of those two components?...
1. Listed below are retention times and peak widths for an HPLC chromatographic separation on a...
1. Listed below are retention times and peak widths for an HPLC chromatographic separation on a 10 cm C18 column a) Calculate the resolution between benzene and benzo[e]pyrene. Compound Unretained Benzene Benzo[e]pyrene Pyrene Coronene Time (min) Baseline Width (min) 0.9 10.9 13.3 16.7 26.1 0.40 0.40 0.45 0.50 b) Is this a good resolution, yes, no, why? c) Calculate the theoretical number of plates for benzo[elpyrene.
The following data applies to a column for liquid chromatography: Use this information to answer the...
The following data applies to a column for liquid chromatography: Use this information to answer the question below Length of column = 30.50 cm Flow rate = 0.313 mL/min A chromatogram of a mixture of species A, B, C, and D provided the following data: Species Retention time, minutes Width of peak base (W), minutes А 5.4 0.41 B 13.3 1.07 C 14.1 1.16 D 21.6 1.72 Calculate the resolution for species C and D Select one: O A 2.60...
L. Choose the correct answer: 1) Reversed phase liquid chromatography refers to (a) the use of...
L. Choose the correct answer: 1) Reversed phase liquid chromatography refers to (a) the use of non polar solvent as the eluent in HPLC. (b) the use of polar material as the stationary phase in a chromatographic column. the use of non-polar material as the stationary phase in a chromatographic column 2) A solute with a retention time of 325 seconds has a base width of 15 seconds. The column is 11.5 cm long. The c (2 points) olumn has...
need help with number 2 HW #3 for Chem 318 Due: April 29, 2019 1. Solute A has a K 2.5 for an extraction between water (phase 1) and chloroform (phase 2). If 100 mL of a 0.01 fraction will be extr...
need help with number 2
HW #3 for Chem 318 Due: April 29, 2019 1. Solute A has a K 2.5 for an extraction between water (phase 1) and chloroform (phase 2). If 100 mL of a 0.01 fraction will be extracted? For the same solute and, what fraction will be extracted if 5 extractions wi 80 mL chloroform each are used (instead of one 400 ml extraction)? M solution containing solute A in water is extracted one time with...
Consider the data below for a liquid chromatography separation of four compounds, A, B, C, and D on a 45.0 cm column. Calculate the number of theoretical plates, N, for each peak. Retention Width at the Time (min) Base (min) 5.24 0.424 Number Number 12.8 1.08 NA = II 14.2 1.12 D 24.1 1.85 Number Number NB = 10 N= What is the average number of theoretical plates, Navg, for the column? Number Navy = avg What is the plate...
EXERCISE 6: Two chemical species, A and B are separated by isothermal gas chromatography, using a 2.00 m column having 5000 theoretical plates at a flow rate of 15.0 ml / min. The peak of unabsorbed air appears after 30 s; the peak of A appears after 5 min and that of B after 12 min (a) Calculate the dead volume VM of the column, and the retention volumes Va and VB. (b) Calculate the reduced volumes V’a and V'B...
Consider a separation performed on a 45.0 mm long open tubular column with a 0.50 mm diameter, and a 2.0 um thick stationary phase. Compound A eluted at 12.41 min, compound B eluted at 13.34 min, and the unretained solvent eluted at 1.130 min. What are the adjusted retention times, t, and retention factors, k, for compounds A and B? Number Number min Number Number min rB What is the relative retention, a, for this separation? Number roll down to...
A student researcher performed a chromatographic separation of caffeine and aspartame. The retention time for caffeine, is, was found to be 218.0 s with a baseline peak width, wc, of 14.4 s. The retention time for aspartame, 1., was 250.5 s with a baseline peak width, w of 21.1 s. The retention time for the unretained solvent methanol was 40.4 s. Calculate the average plate height, H, in micrometers for this separation, given that it was performed on a 27.7...
3. a) b) c) How many theoretical plates produce a chromatography peak eluting at 4.78 min with a full width at half max (FWHM) of 1.20 s? The length of the column is 30.0 m. What is the plate height in microns? What is the peak resolution for this peak and another peak eluted at 4.73 minutes that has a full peak width (measured at the base) of 2.14 seconds? Is this sufficient for quantitative analysis of those two components?...
1. Listed below are retention times and peak widths for an HPLC chromatographic separation on a 10 cm C18 column a) Calculate the resolution between benzene and benzo[e]pyrene. Compound Unretained Benzene Benzo[e]pyrene Pyrene Coronene Time (min) Baseline Width (min) 0.9 10.9 13.3 16.7 26.1 0.40 0.40 0.45 0.50 b) Is this a good resolution, yes, no, why? c) Calculate the theoretical number of plates for benzo[elpyrene.
The following data applies to a column for liquid chromatography: Use this information to answer the question below Length of column = 30.50 cm Flow rate = 0.313 mL/min A chromatogram of a mixture of species A, B, C, and D provided the following data: Species Retention time, minutes Width of peak base (W), minutes А 5.4 0.41 B 13.3 1.07 C 14.1 1.16 D 21.6 1.72 Calculate the resolution for species C and D Select one: O A 2.60...
L. Choose the correct answer: 1) Reversed phase liquid chromatography refers to (a) the use of non polar solvent as the eluent in HPLC. (b) the use of polar material as the stationary phase in a chromatographic column. the use of non-polar material as the stationary phase in a chromatographic column 2) A solute with a retention time of 325 seconds has a base width of 15 seconds. The column is 11.5 cm long. The c (2 points) olumn has...
need help with number 2
HW #3 for Chem 318 Due: April 29, 2019 1. Solute A has a K 2.5 for an extraction between water (phase 1) and chloroform (phase 2). If 100 mL of a 0.01 fraction will be extracted? For the same solute and, what fraction will be extracted if 5 extractions wi 80 mL chloroform each are used (instead of one 400 ml extraction)? M solution containing solute A in water is extracted one time with...
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