Question

4.2 (a) The distances travelled by four compounds and the solvent front after a TLC separation on a polar silica plate were as follows: Compound Distance travelled Solvent 7.5 cm A 4.2 cm B 3.5 cm C 2.3 cm D 2.3 cm Calculate the $R_f$ value of each compound, clearly draw the TLC results and comment on the polarity of each compound. (b) Roughly draw a GC chromatogram for the TLC results in (a) above. 4.3 Discuss the basic principles of GC, HPLC and TLC. 4.4 Differentiate between planar and column chromatographic methods.

Name: 42 a the distances travelled by four compounds and the solvent front after a tlc separation on a polar silica plate were as follows compound distance travelled solvent 75 cm a 42 cm b 35 cm 07668
Uploaded: 2022-10-18T03:19:37-08:00
Duration: 5 min 14 s
Channel: Sulav Pokhrel
Description: 42 a the distances travelled by four compounds and the solvent front after a tlc separation on a polar silica plate were as follows compound distance travelled solvent 75 cm a 42 cm b 35 cm 07668

          4.2
(a) The distances travelled by four compounds and the solvent front after a TLC separation on a polar silica plate were as follows:
Compound	Distance travelled
Solvent	7.5 cm
A	4.2 cm
B	3.5 cm
C	2.3 cm
D	2.3 cm
Calculate the $R_f$ value of each compound, clearly draw the TLC results and comment on the polarity of each compound.
(b) Roughly draw a GC chromatogram for the TLC results in (a) above.
4.3 Discuss the basic principles of GC, HPLC and TLC.
4.4 Differentiate between planar and column chromatographic methods.

42 a the distances travelled by four compounds and the solvent front after a tlc separation on a polar silica plate were as follows compound distance travelled solvent 75 cm a 42 cm b 35 cm 07668

Added by Robyn M.

Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

Instant Answer

Solved by Expert Sulav Pokhrel

10/18/2022

Step 1

The $R_f$ value is calculated as the distance travelled by the compound divided by the distance travelled by the solvent front. $R_fA = \frac{4.2}{7.5} = 0.56$ $R_fB = \frac{3.5}{7.5} = 0.47$ $R_fC = \frac{2.3}{7.5} = 0.31$ $R_fD = \frac{2.3}{7.5} = 0.31$ Show more…

Show all steps

Thanks for your feedback!

4.2 (a) The distances travelled by four compounds and the solvent front after a TLC separation on a polar silica plate were as follows: Compound Distance travelled Solvent 7.5 cm A 4.2 cm B 3.5 cm C 2.3 cm D 2.3 cm Calculate the $R_f$ value of each compound, clearly draw the TLC results and comment on the polarity of each compound. (b) Roughly draw a GC chromatogram for the TLC results in (a) above. 4.3 Discuss the basic principles of GC, HPLC and TLC. 4.4 Differentiate between planar and column chromatographic methods.