chromatography. Flashcards
1
Q
what different stages does chromatography involve?
A
stationary phase- doesn’t move.
mobile phase- moves.
2
Q
in paper chromatography what is the stationary phrase?
A
absorbent paper.
3
Q
in paper chromatography what is the mobile phrase?
A
solvent- often water.
4
Q
what does chromatography seperate?
A
mixtures into their constituent components.
5
Q
what does the solvent dissolve?
A
dissolves the samples and carries them up the paper.
6
Q
what can chromatography be used to identify?
A
artificile colours by comparing them to the results obtained from known substances.
7
Q
how do you work out the Rf value?
A
Rf= distance moved by substance/ distance moved by solvent.
