Chromotography

Question 1

What does chromatography mean

Answer 1

Chromatography is a separating technique where mixtures of colour and non colour are seperated soluble in the solvent

Question 2

Explain the chromatography practical (6)

Answer 2

1)Draw the start line with pencil on a paper
2)Using a capillary tube add the 4 food dye on the paper making sure that they are 2 cm away from each other and no on the edge of the paper
3)Pour water (solvent) in the beaker making sure it is shallow being lower then the dots
4)Attach paper on glass rod and put it in the beaker
5) Leave the paper in the beaker letting the pigment travel up the paper
6)After remove the paper and draw the solvent front with pencil
7)measure the distance of the solvent front and the pigment

Question 3

Formula for chromatography

Answer 3

Rf = pigment distance travel ÷ distance of solvent

Question 4

What is the stationary phase

Answer 4

When there is no movement in the chromatography paper

Question 5

What is the mobile phase

Answer 5

When the pigment dissolve and travels up the paper

Question 6

A student does a chromatography practical and there was error
states 2 things the student did wrong

Answer 6

Drew start line with ink ( the ink would also travel up)
Solvent above the pigments ( pigment get washed off)