paper chromatography Flashcards
1
Q
what is a solvent?
A
a liquid that will dissolve substances
2
Q
what is meant by the mobile phase?
A
where the molecules can move
3
Q
what is meant by the stationary phase?
A
the molecules cannot move
4
Q
what will a pure compound produce?
A
a single spot in all solvents
5
Q
what will a mixture produce?
A
different spots depending on the solvent
6
Q
which type of substance travels further up the paper?
A
a more soluble substance travels further up the paper
7
Q
why do we draw our line in pencil?
A
if we drew line in pen, pen ink would move up the paper
8
Q
what is the formula for rf value?
A
distance moved by substance/ distance moved by solvent
