Required Practical: Chromatography

Question 1

Step 1

Answer 1

Draw pencil line on chromatography paper 2cm up from bottom

Question 2

Step 2

Answer 2

Mark 5 pencil spots at equal spaces across the line

Question 3

Step 3

Answer 3

Use capillary tube to put a small spot of known food colours and unknown colours onto pencil spots

Question 4

Step 4

Answer 4

Pour 1cm of water into beaker
Attach paper to a rod and lower it in the water so the bottom of it touches the water

Question 5

Why can the sides of the beaker not touch sides of paper?

Answer 5

Intereses with the way water moves

Question 6

Step 5

Answer 6

Put lid on beaker to stop evaporation of water

Question 7

Step 6

Answer 7

Not move the beaker and wait for the water to travel up the paper

Question 8

Step 7

Answer 8

Draw pencil line to mark where water reached on the paper
Hang paper up to dry

Question 9

Step 8

Answer 9

Analyse unknown colour, who’s spots line up with the known colours
Showing what it’s a mixture of

Question 10

Rf values

Answer 10

Ways we identify what the chemicals are in chromatography

Question 11

Rf calculation

Answer 11

Distance the chemical moves
——————————————
Distance the solvent moves