8. What should the height of liquid be in a TLC elution jar? a. There should be no liquid in the jar b. The liquid should be just below the spot line so that it does not dissolve the spot c. The liquid should be just above the spot line so that it can dissolve the spot d. The liquid should be just above the top of the plate so that it can dissolve all the spots 9. A compound or mixture of compounds is found to have an Rf value of ~0.95 when using pure ethyl acetate as the eluting solvent for TLC. What effect would lowering the concentration of ethyl acetate and raising the concentration of heptane have on the Rf value(s), and why?
8. What should the height of liquid be in a TLC elution jar? a. There should be no liquid in the jar b. The liquid should be just below the spot line so that it does not dissolve the spot c. The liquid should be just above the spot line so that it can dissolve the spot d. The liquid should be just above the top of the plate so that it can dissolve all the spots 9. A compound or mixture of compounds is found to have an Rf value of ~0.95 when using pure ethyl acetate as the eluting solvent for TLC. What effect would lowering the concentration of ethyl acetate and raising the concentration of heptane have on the Rf value(s), and why?
Chemistry
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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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8. What should the height of liquid be in a TLC elution jar?
a. There should be no liquid in the jar
b. The liquid should be just below the spot line so that it does not dissolve the spot
c. The liquid should be just above the spot line so that it can dissolve the spot
d. The liquid should be just above the top of the plate so that it can dissolve all the
spots
9. A compound or mixture of compounds is found to have an Rf value of ~0.95
when using pure ethyl acetate as the eluting solvent for TLC. What effect
would lowering the concentration of ethyl acetate and raising the
concentration of heptane have on the Rf value(s), and why?
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