TLC - Identity of an Unknown10 cm7 cmA5.3 cmBAPart C: Determination of unknown:4.1 cmCB CDA =Solvent FrontB =C =OHDrawingD= unknown compoundA=TylenolB= AspirinC= CaffeineD= Unknown d. Explain why the Rf values changed when the cluant was changed from 100% petroleumether to a 70/30 mixture of petroleum ether/diethyl ether.Part B. Polarity RankingRank the compounds in order of increasing polarity (1= least polar, 3 = most polar)NH₂OHPart C. Determination of an Unknown1. Unknown ID:2. Identify of your unknown sample:NH₂ofOH3. In the space below, sketch the TLC plate or plates that you used to determine the identity ofyour known below. Be sure to label each lane on each plate and list the eluant used to developthe plate. Tape your TLC plate(s) to a piece of paper, label them appropriately, and attach thepaper to this report sheet.

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TLC - Identity of an Unknown A B C D A = B = C = D= C OH unknown compound

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter9: Atomic Absorption And Atomic Fluorescence Spectrometry

Section: Chapter Questions

Problem 9.6QAP

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Question

TLC - Identity of an Unknown
10 cm
7 cm
A
5.3 cm
B
A
Part C: Determination of unknown:
4.1 cm
C
B CD
A =
Solvent Front
B =
C =
OH
Drawing
D= unknown compound
A=Tylenol
B= Aspirin
C= Caffeine
D= Unknown

d. Explain why the Rf values changed when the cluant was changed from 100% petroleum
ether to a 70/30 mixture of petroleum ether/diethyl ether.
Part B. Polarity Ranking
Rank the compounds in order of increasing polarity (1= least polar, 3 = most polar)
NH₂
OH
Part C. Determination of an Unknown
1. Unknown ID:
2. Identify of your unknown sample:
NH₂
of
OH
3. In the space below, sketch the TLC plate or plates that you used to determine the identity of
your known below. Be sure to label each lane on each plate and list the eluant used to develop
the plate. Tape your TLC plate(s) to a piece of paper, label them appropriately, and attach the
paper to this report sheet.

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