CHE 106 Lecture 26: Lecture 26- Chapter 8, Sections 3&4

1) Too much sample applied (Spotted)

2) Solvent (mobile phase) polarity too high

3) Solvent (mobile phase) polarity too low

4) Forgetting to cover the developing plate

5) Spotting the plate below the liquid level in the developingchamber

6) Forgetting to place a piece of filter paper in the developingchamber

Rank the following bonds in order of increasing polarity.

1. H—Cl, H—O, H—Br  
2. O—F, P—O, Al—O
3. H—Cl, Br—Br, B—N
4. P—N, S—O, Br—F

Rank the following bonds in order of increasing polarity.

a. H−Cl, H−O, H−Br

b. O−F, P−O, Al−O

c. H−Cl, Br−Br, B−N

d. P−N, S−O, Br−F