Q3. Chromatography can be used to separate components of a mixture.
(a)
A student used paper chromatography to analyse a black food
colouring.
The student placed spots of known food colours, A, B, C, D and E,
and the black food colouring on a sheet of chromatography paper.
The student set up the apparatus as shown in Diagram 1.
Diagram 1
A
B
C D
OE
6
Lid
Chromatogra
paper
Solvent
Start line
drawn in ink
Black food
colouring
The student made two errors in setting up the apparatus.
Identify the two errors and describe the problem each error would
cause.