Chromatography 2.1.2 (s) Flashcards
1
Q
what is chromatography used for?
A
to separate compounds in a mixture
2
Q
what are the two phases in chromatography?
A
stationary
mobile
3
Q
what is the mobile phase?
A
phase where the molecules can move
4
Q
what is the mobile phase in TLC?
A
the solvent
5
Q
what is the stationary phase?
A
phase which cannot move
6
Q
what is the stationary phase in paper chromatography?
A
the chromatography paper
7
Q
what is the stationary phase in TLC?
A
the silica gel
8
Q
what causes components in a mixture to spread out?
A
the time they spend in the mobile phase
9
Q
what is the Rf value?
A
ratio of distance travelled by solute to the distance travelled by solvent
10
Q
equation for Rf value?
A
Rf = distance moved by solute / distance moved by solvent
