C8: CHROMATOGRAPHY Flashcards
1
Q
What is a pure substance?
A
a single element/compound not mixed with any other substance
2
Q
What is a formulation?
A
a mixture that has been designed as a useful product
3
Q
What is the stationary phase in chromatography?
A
chromatography paper
4
Q
What is the mobile phase in chromatography?
A
the solvent
5
Q
Which dye moves furthest up the paper?
A
the most soluble dye
6
Q
Chromatography method
A
-draw start line in pencil
-place spots of ink on the start line
-add solvent to the beaker
-place paper in beaker so the start line is above the solvent
-add a lid (depending on solvent)
-wait for dyes to travel up the paper
-remove paper from water and leave to dry
7
Q
How do you calculate Rf values?
A
Rf = distance travelled by substance (cm) / distance travelled by solvent front (cm)
