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10. If an eluent of too high polarity is used for the development of a TLC plate, will the sample spots be somewhere in the middle, way at the bottom, or way at the top of the plate?

10. If an eluent of too high polarity is used for the development of a TLC plate, will the sample spots be somewhere in the middle, way at the bottom, or way at the top of the plate?

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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4. Did increasing the polarity of your eluent increase or decrease your Rr's? 3. Given that the solid surface is polar, explain why polar samples have lower Rf values than less polar ones. 6. Explain why increasing eluent polarity increases the Rf value for a given sample? 7. In what order, from top to bottom, would you expect to see the spots for naphthalene (C10H8), butyric acid (CH3CH,CH,CO,H), and phenyl acetate (CH,CO,CH5)? Top Middle Bottom 8. In what order, from top to bottom, would you expect to see the spots for the following: dop 2nd 3rd 4th acetic acid = CH3CO2H butanal = CH3CH2CH2CHO; 2-octanone = CH3COCH2CH2CH2CH2CH2CH3 deeane C10H22; 1-butanol = CH3CH2CH2CH2OH %3D Bottom %3D %3D 9. If an eluent of too low polarity is used for the development of a TLC plate, will the sample spots be somewhere in the middle, way at the bottom, or way at the top of the plate? 10. If an eluent of too high polarity is used for the development of a TLC plate, will the sample spots be somewhere in the middle, way at the bottom, or way at the top of the plate?
Transcribed Image Text:4. Did increasing the polarity of your eluent increase or decrease your Rr's? 3. Given that the solid surface is polar, explain why polar samples have lower Rf values than less polar ones. 6. Explain why increasing eluent polarity increases the Rf value for a given sample? 7. In what order, from top to bottom, would you expect to see the spots for naphthalene (C10H8), butyric acid (CH3CH,CH,CO,H), and phenyl acetate (CH,CO,CH5)? Top Middle Bottom 8. In what order, from top to bottom, would you expect to see the spots for the following: dop 2nd 3rd 4th acetic acid = CH3CO2H butanal = CH3CH2CH2CHO; 2-octanone = CH3COCH2CH2CH2CH2CH2CH3 deeane C10H22; 1-butanol = CH3CH2CH2CH2OH %3D Bottom %3D %3D 9. If an eluent of too low polarity is used for the development of a TLC plate, will the sample spots be somewhere in the middle, way at the bottom, or way at the top of the plate? 10. If an eluent of too high polarity is used for the development of a TLC plate, will the sample spots be somewhere in the middle, way at the bottom, or way at the top of the plate?
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