In an isothermal gas chromatographic method with a capillary column. If you increase the temperature in...
In an isothermal gas chromatographic method with a capillary column.
If you increase the temperature in the oven. What effect does this have on retention time, retention factor, plate height, plate number, resolution and separation factor?
Homework Answers
If we increase the temperature, retention time decreases. As temperature increases, the velocity of movement of gas increases. So it will elute faster in the column.
Retention factor is the ratio between, retention time of compound to retention time of mobile phase. This is directly proportional to temperature. So with temperature, Retention factor decreases.
Plate number is directly proportional to retention time. So with temperature, plate number (N) decreases.
Plate height(H) is inversely proportional to plate number(N). So with temperature, plate height increases.
NH = L , L - total column length
Resolution is directly proportional to retention time. So with temperature, resolution decreases.
Separation factor is directly proportional to retention time. So with temperature, separation factor decreases.
Add Answer to:
In an isothermal gas chromatographic method with a capillary
column.
If you increase the temperature in...
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...
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...
A student researcher performed a chromatographic separation of caffeine and aspartame. The retent...
A student researcher performed a chromatographic separation of caffeine and aspartame. The retention time for caffeine, lc, was found to be 203.8 s with a baseline peak width, wc, of 13.8 s. The retention time for aspartame, ta, was 272.4 s with a baseline peak width, wa, of 21.5 s. The retention time for the unretained solvent methanol was 43.7 s Calculate the average plate height, H, in micrometers for this separation, given that it was performed on a 22.7...
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
As you increase the gas chromatography column temperature, analytes’ ______________ increases and stationary phase solubility _______________....
As you increase the gas chromatography column temperature, analytes’ ______________ increases and stationary phase solubility _______________. A) boiling point; increases B) vapor pressure; decreases C) vapor pressure; increases D) retention time; increases E) retention time; decreases
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...
for gas chromotography, describe how and explain why column temperature affects resolution, retention and total analysis...
for gas chromotography, describe how and explain why column temperature affects resolution, retention and total analysis time
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 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...
A number of factors determine the rate at which a given compound travels through a gas chromatograph. List two of t...
A number of factors determine the rate at which a given compound travels through a gas chromatograph. List two of these factors: The period following injection that is required for a compound to pass through the column is called the What would happen to the retention time of a compound if the following changes were made? Decrease the flow rate of the carrier gas Increase the temperature of the column Increase the length of the column How do the temperature...
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...
A student researcher performed a chromatographic separation of caffeine and aspartame. The retention time for caffeine, lc, was found to be 203.8 s with a baseline peak width, wc, of 13.8 s. The retention time for aspartame, ta, was 272.4 s with a baseline peak width, wa, of 21.5 s. The retention time for the unretained solvent methanol was 43.7 s Calculate the average plate height, H, in micrometers for this separation, given that it was performed on a 22.7...
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...
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 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 number of factors determine the rate at which a given compound travels through a gas chromatograph. List two of these factors: The period following injection that is required for a compound to pass through the column is called the What would happen to the retention time of a compound if the following changes were made? Decrease the flow rate of the carrier gas Increase the temperature of the column Increase the length of the column How do the temperature...
Most questions answered within 3 hours.
-
Consider the reaction, C3 H8 + O2 --> CO2 + H2O. How many
moles of O2...
asked 58 minutes ago -
You and your opponent both roll a fair die. If you both roll the
same number,...
asked 1 hour ago -
In a study of the accuracy of fast food drive-through orders,
Restaurant A had 257 accurate...
asked 1 hour ago -
Identify and describe in detail the four categories of
institutions that could be included in a...
asked 1 hour ago -
In python
class Customer:
def __init__(self, customer_id, last_name, first_name, phone_number, address):
self._customer_id = int(customer_id)
self._last_name =...
asked 1 hour ago -
What is an example of a limitation in implementing a new
ERP system and how it...
asked 1 hour ago -
In a section of 9.7cm of an artery with a radius of 2.6mm there
is a...
asked 1 hour ago -
the two carboxylic acid groups of aspartic acid have different
acidities with pKa values of 2.1...
asked 1 hour ago -
Would CuCO3 aqueous salt combined with calcium chloride
form a solid precipitate? If so, what would...
asked 1 hour ago -
How do ECM Solutions assist in embedding a culture of continuous
improvement in an organization? (Project...
asked 1 hour ago -
Directions
These directions introduce the idea of Essential Questions.
Since this may be a new concept...
asked 1 hour ago -
1.b. Fiscal policy is said to suffer from ‘crowding out’.
Explain what this means and why...
asked 2 hours ago