Homework Answers
Add Answer to:
20 > Species A and B were separated using column chromatography. The elution time for species...
Species A and B were separated using column chromatography. The elution time for species A (tA)...
Species A and B were separated using column chromatography. The elution time for species A (tA) was 200 s with a peak width (wA) of 35 s, and the elution time for species B (tB) was 353 s with a peak width (wB) of 51 s. What is the length of the column (in centimeters) if the theoretical plate height for species B is 3.0 mm? L=
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...
The table contains data for a liquid chromatography separation of four compounds, A, B, C, and...
The table contains data for a liquid chromatography separation of four compounds, A, B, C, and D, on a 40.0 cm column Retention Compound time (min) Width at the base (min) A 5.17 0.436 B 1.02 13.0 15.0 C 1.10 23.4 1.91 Calculate the number of theoretical plates, N, for each peak. NA NB Nc ND = What is the average number of theoretical plates, Navg, for Navg the column? What is the plate height, H, for the column? Н-...
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
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?...
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...
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, tc,was found to be 207.6 s with a baseline peak width, wc, of 16.2 s. The retention time for aspartame, ta, was 253.7 s with a baseline peak width, wa, of 18.7 s. The retention time for the unretained solvent methanol was 40.7 s. Calculate the average plate height, H, in micrometers for this separation, given that it was performed on a 27.3 cmlong...
During a liquid chromatography lab, caffeine and theophylline were separated into an octadecyl silica column (C18)...
During a liquid chromatography lab, caffeine and theophylline
were separated into an octadecyl silica column (C18) with a mobile
phase consisting of a mixture of water and methanol.
What is the elution scheme?
b) Reason with current theory as background what is expected to happen
the retention factors in case:
- the methanol content in the mobile phase is increased?
- the flow rate is increased?
- the column is replaced with one consisting of octyl silica (C8)?
- switching...
Species 1, 2, 3, and 4 were separated using gas chromatography (species 1 is the solvent)....
Species 1, 2, 3, and 4 were separated using gas chromatography (species 1 is the solvent). Answer the following multiple choice question based on the chromatogram shown below. Which of the following statements are true regarding the chromatogram shown above? At t = 8 min, there is more of species 1 in the stationary phase compared to species 4. Species 4 has the highest partition coefficient. At t = 8 min, there is more of species 4 in the stationary...
A GC column is operated under the following conditions: Column: 1.10 m x 2 mm packed...
A GC column is operated under the following conditions: Column: 1.10 m x 2 mm packed with Chromosorb P and Carbowax 20M as stationary phase. The following retention times were obtained: air: 18.0 sec; methylacetate: 2.98 min; methyl propionate: 4.56 min. Peak width at half height: methylacetate: 7.7 sec; methyl propionate: 12.4 sec. Calculate: a) the corrected retention time for each solute. b) the capacity factor k' for each solute. c) the selectivity factor α for the pair of solutes....
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...
The table contains data for a liquid chromatography separation of four compounds, A, B, C, and D, on a 40.0 cm column Retention Compound time (min) Width at the base (min) A 5.17 0.436 B 1.02 13.0 15.0 C 1.10 23.4 1.91 Calculate the number of theoretical plates, N, for each peak. NA NB Nc ND = What is the average number of theoretical plates, Navg, for Navg the column? What is the plate height, H, for the column? Н-...
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?...
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...
During a liquid chromatography lab, caffeine and theophylline
were separated into an octadecyl silica column (C18) with a mobile
phase consisting of a mixture of water and methanol.
What is the elution scheme?
b) Reason with current theory as background what is expected to happen
the retention factors in case:
- the methanol content in the mobile phase is increased?
- the flow rate is increased?
- the column is replaced with one consisting of octyl silica (C8)?
- switching...
Species 1, 2, 3, and 4 were separated using gas chromatography (species 1 is the solvent). Answer the following multiple choice question based on the chromatogram shown below. Which of the following statements are true regarding the chromatogram shown above? At t = 8 min, there is more of species 1 in the stationary phase compared to species 4. Species 4 has the highest partition coefficient. At t = 8 min, there is more of species 4 in the stationary...
Most questions answered within 3 hours.
-
You capture data by having 8 people fill in 30 small dots on a
piece of...
asked 3 hours ago -
What are the z-values such that 70% of the area lies in the
middle of the...
asked 4 hours ago -
You borrow $29,500 to purchase a brand new car. The interest
rate is 6%, and the...
asked 4 hours ago -
The amount of time it takes an asteroid, whose average distance
from the Sun is 4.70...
asked 4 hours ago -
A 0.289 kg mass slides on a frictionless floor with a speed of
1.34 m/s. The...
asked 4 hours ago -
15.A box contains five red balls, three green balls, and two
yellow balls. Suppose you select...
asked 7 hours ago -
Assume you are given the following for Stackelberg industries:
Return on Assets (ROA) = 8%
Debt...
asked 6 hours ago -
an engineer proposes to use mmWave in 5G network to
increase data rate.
What are the...
asked 6 hours ago -
Explain the idea behind using SEMIJOIN in distributed
query processing.
asked 6 hours ago -
why
is context important in selecting and applying guidelines and
principles for interface design?
illustrate your...
asked 6 hours ago -
In a certain board game, a player rolls two fair six-sided dice
until the player rolls...
asked 7 hours ago -
You are going to deposit $3,200 in an account that pays .58
percent interest compounded quarterly....
asked 6 hours ago