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Author Question: A wick of filter paper is placed in a TLC developing jar, and the atmosphere in the jar is satu ... (Read 42 times)

K@

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on: Aug 23, 2018

A wick of filter paper is placed in a TLC developing jar, and the atmosphere in the jar is satu
  rated with solvent before a plate is developed. What would happen if a plate were developed
  in a jar with an atmosphere not saturated with solvent vapor?



Question 2

If two compounds have Rf values of 0.50 and 0.61, how far will they be separated from each
  other on a plate when the solvent front is developed to
  (a) 5 cm?
  (b) 15 cm?



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Gabe

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Reply #1 on: Aug 23, 2018
Answer to Question 1

The solvent front would not move evenly up the plate because it would be evaporating from
the plate. Also the Rf from such a plate would be unreliable because more solvent is moving up
the plate than normal, moving the spot farther up the plate than it should be.



Answer to Question 2

(a) x cm/5.0 cm = 0.50; x = 2.5 cm. Similarly, y = 3.05 cm. Separation = 3.05  2.5) = 0.55 cm.
(b) 1.65 cm



K@

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  • Posts: 608
Reply 2 on: Aug 23, 2018
Great answer, keep it coming :)

FergA

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Reply 3 on: Yesterday
Gracias!

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