3. Consider the following silica gel TLC plate of compounds A, B, and C developed in hexanes. 0 - solvent foat origin A B C Determine or estimate the Rr values of compounds A, B, and C run on the TLC plate.
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- The same polar compound is gas chromatographed on an SE-30 (very nonpolar) column and then on a Carbowax 20M (very polar column). I low will K=cS/cM vary between the two columns?Silica gel is very polar stationary phase. Therefore, more polar molecule sticks to silica gel on the TLC plate and has higherRfvalue. True FalseWhat is the mobile phase for the separation shown and the relative retention between peak 3 &4?
- The following TLC plate (coated with silica gel) was obtained by separating five different samples using hexane as the mobile phase. 6. D с 8,1 cm 6,5 cm B 4,4 cm A 2,3 cm 1 2 3 4 • 5 Solvent front = 10 cm 9,3 cm J 7,8 cm 5,2 cm 3,4 cm 2,3 cm 1,5 cm I H G F E 2. Which of the samples is not a mixture, explain your answer. (2) 3. Compound A in sample 1 and a compound F in sample 3 travelled the same distance. What does this tell us about the compounds? (3) Explain how we can identify the names of the compounds have been separated by TLC (3)4. A) Why is high pressure pump needed in HPLC. B) Why is UPLC is with a higher efficiency than HPLC. C) What are the advantages & disadvantages of suing UPLC over HPLC? 5. Explain the rational for each of the steps for flushing a C18 column. 1) flush the column initially with 5-10 column volumes of the most recent mobile phase without buffer; 2) flush with 10-20 volumes of strong solvent (90% acetonitrile); 3) Store the column in strong solvent. 4) Equilibrate with 10-2- volumes of new, desired, buffered mobile phase. 6. Label on the diagram on the below components 1 to 5 of a high-performance liquid chromatographic system. Briefly describe the function of each com nent. 3 2 4 Flow controller Waste 7. Label on the diagram on the above components 1 to 5 of a gas chromatographic system. Briefly describe the function of each component. 8. Use your own words, explain what does each of the following terms mean in analytical chemistry. a) Qualitative analysis; b) Quantitative analysis. c)…1. A two-component mixture is analyzed by paper TLC. Component A is more soluble in the mobile phase than component B. The following result is obtained. Calculate the Rifor each component and label the identity of each Frond (3-0,4)CM3D2.6cmr A (2-6-04 m = 2.2cm B C67-0.ycm=0.3cm RF (A= 2.2cm = 0.85 2. Lem spot. 2 39で Solvent Front A0-2.6m %3D 3cm Spoting Line Rf (8- 0.3cm 2. Scm = 0.12 %3D 2. Which one is the more polar component? Explain IS morC polo Because its Rf Is low 3. If a more polar solvent (mgbil phase) is used for the above experiment, the result will be: O Both component A and Component B will travel further up the plate-Distance may verur b) Only Component A will travel further up the plat c) Only Component B will travel further up the plat d) They will travel on the plate the same distance as when a less polar Choose one of the answers and explain 4. Paper chromatography works as the same principle as TLC however, cellulose paper (the same as filter paper) is used for…
- The result of a TLC experiment showed that Compound X has an Rf values of 0.25 on a silica plate using 10% ethyl acetate in hexane as the mobile phase. Indicate if the Rfvalues of Compound X would be higher or lower in the following solvents: 50 % Ethyl Acetate in hexaneThe dehydration of cyclohexanol can also be monitared by reverse phatse HPLC. The retention time for Compound 1 will: OH Sulfuric acid heat 1 Select one: O a. be longer than that of compound 2 (Compound 1 wil come out of the columin l O b. be shorter than that of compound 2 (Compound 1 wilcome out of the colume fest O c. be equal to that of compound 2 (Compounds 1 and 2 will come out at the same ne O d. depend on the pH of the mobile phase MacBook AHow the 2D Thin layer Chromatography separation processes are worked? Please shortly wtite at your own words. Answer should be to the point (5-6 lines maximum).
- 4. Extraction: a) ( ) In what order (from lowest to highest R,) would you expect to find compound X, Y and Z on a silica gel TLC plate developed with dichloromethane? CO₂H NH compound Y compound X b) ( compound Z Explain how you could separate an equimolar mixture of Compound X, Y and Z. (a flow chart). Organic solvent: ether, methylenechloride; Aqueous solution: HCI (ag), NaOH (aq), NaHCO3(aq)1) A mixture of benzoic acid, para-xylene and benzaldehyde is spotted on a silica gel TLC plate and developed using Ethyl Acetate with 0.5% acetic acid as the solvent. Predict the relative Rf values for the three components in the sample (highest to lowest).A Stydent attempled to puriN a moduct mxture by calumo Chromatography with a silica gel Colu mo and ethyl autate 9s The elxant. h Studint colluted lo fractunš and ran q ThC f cach fractun (Shown beland) 0000O 34 5 6 7 8 9 10 If ethanol had ban 4scd as the elyant rather than ethyl acetate, oyll yoy expect The separatiin to be better, worse, or no change?
