On the next page is an LC separation of the parabens found in baby wash. Parabens aresuspected in a link to breast cancer therefore an accurate way to quantitate them is desired.a. In the chromatogram, estimate k' for ethyl paraben. Clearly indicate what values you used forall the terms in your calculation.b. Is this a "good" value for a capacity factor? Explain.c. What is the resolution between n-Propyl paraben and n-Butyl paraben? Again, indicate clearlywhat values you used in your calculation.MAU| Methyl paraben40200-2Ethyl paraben n-Propyl parabenn-Butyl parabenApp ID 2292568min

Step 1: Step 2: Step 3: Step 4:

Answered: On the next page is an LC separation of…

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter4: Least-squares And Calibration Methods

Section: Chapter Questions

Problem 3P

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16. In this chromatographic technique the mobile should consists of buffer solution or with known high ionic strength A. GC-MS B. RP-HPLC C. IEC D. NP-HPLC
I) Choose the Correct Answer from the Multiple-Choice List (10) 1. Which of the following is not a common type of packing for reversed-phase HPLC? C. Diol D. phenyl A. C18 B. C8 2. Gradient elution is a separation that employs : a. a single solvent of constant composition. b. solvent mixture of constant composition. c. two or more solvent systems that differ significantly in polarity. d. both (a) and (b). 3. The most useful bonded-phase coatings in HPLC are . : a) glass b) alumina c) inert silica d) siloxanes 4.Which of the following solvents is not commonly used in reversed-phase HPLC? a) Ethanol Water b) Hexane c) Acetonitrile d) Methanol e) water 5. It is not of the solute property detector used in HPLC is: a. Refractive index detector b. UV detector c. fluorescence detector d. UV-visible detector 6. High performance liquid chromatography (HPLC) can be used to : a. identify the various pigments from a leaf extract. b. separate types of organic pesticides. c. determine the mercury…
1) Study the chromatograph (below) of a mixture of Compounds A and B, run on the GCs in the teaching labs at CU Boulder. Compound A has the shorter retention time. STAAT 61 1.11 227 RT TYPE AREA XXXX XXXX XXXX AREAS 0.009 55874 44.117 ARIHT 0.61 XX XX XX 1.11 2.27 XX XX XX TOTAL AREA=XX MUL FACTOR=XX 1. What is the retention time of compound A? Compound B? 2. Which compound is present in a larger amount? 3. Which compound has the lower boiling point? 4. What would happen to the retention times of compounds A and B if the column temperature were raised? 5. You suspect that compound B is octane. What can you do to provide supporting evidence for this hypothesis?
7. In gas chromatography, increasing the column length leads to analytes, assuming all other parameters are kept constant. a. no effect on b. an increase in C. a decrease in 8. Suppose you are extracting an organic compound from an aqueous solution using retention time for dichloromethane. a. top layer b. bottom layer Once you mix the two layers together, which layer is the organic extract? 6001 9. Which way is best to remove an acidic impurity from an organic liquid that is immiscible with water? a. simple distillation b. wash with aqueous base c. wash with aqueous acid d. recrystallization it in diegolved in a volatile
Thin Layer Chromatography. All types of chromatography have mobile phaseand stationary phase. What is a stationary phase and a mobile phase? Elaborate your answer.
please solve parts d and e and f, last three parts and thanks alot
Which one is the more polar component? Explain.
كرة HPLC Q3: The Figure shown a HPLC chromatogram of two compound .Calculate the following values using the data in this chromatogram. Detector signal a. The adjusted retention time of uracil and guanine. b. The peak widths for uracil and guanine. The retention factor for uracil and guanine. C. d. The selectivity factor for uracil and guanine. e. The resolution for these two compounds. f. The column efficiency parameters, N and H, if the column length is 10cm. 0.6- 05 04 03 0.2 0.1- 45.0 s vold A 15 30 45 تختبر تحليل الى 180.0 s Auracil 90 60 76 2475s guanine 105-120 135 150 166 180 195 210 225 240 255 270 296 Time, seconds
The surface of the silica gel has a structure that looks like this diagram below. Suppose you used a plate coated with silica gel, with propanone, CH3COCH3, as the solvent for thin-layer chromatography. Suppose also that the mixture you were trying to identify contained benzaldehyde benzanilide phenol 1) rank the Rf value from large to small 2) name the IMF between each compound and the silica gel OH OH OH -0-Si-O-Si-O-Si-O- O main body of silica structure
Sketch a chromatogram for a compound with a stronger interaction with the stationary phase than the one shown below (draw on top of the shown chromatogram). Briefly explain how and why it is different.
For quantitative analysis with gas chromatography: O the area of a peak reported by the instrument for a compound is proportional to the quantity of that compound. O the calculated response factor value for a compound is proportional to the quantity of that compound. O the retention time reported by the instrument for a compound is proportional to the quantity of that compound. O the peak height reported by the instrument for a compound is inversely proportional to the quantity of that compound. O the peak shape reported by the instrument for a compound is proportional to the quantity of that compound.
Which of the following compounds will elute LAST in a reverse phase chromatography? а. b. Br с. NH2 d.

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