Paper Chromatography

Question 1

Different substances have different __________

Answer 1

solubilities

Question 2

What type of tube is used to place the compound on the paper?

Answer 2

Capillary tube

Question 3

Why must the pencil line with spots of ink be above the solvent?

Answer 3

Solvent will wash the ink off

Question 4

Why mustn’t the paper touch the sides of the beaker?

Answer 4

It will interfere with the way the solvent moves

Question 5

Why place a lid on the beaker?

Answer 5

Limit evaporation of the solvent.

Question 6

When is the paper removed from the beaker?

Answer 6

When the solvent has travelled 3/4 up the paper

Question 7

What is the name of the point which the solvent reached on the paper?

Answer 7

Solvent front

Question 8

What’s the equation for Rf Value?

Answer 8

Rf = Distance travelled by chemical
Distance travelled by solvent

Question 9

Why might an ink with MORE than 2 compounds appear to ONLY have 2 compounds.

Answer 9

Compounds have similar properties so travel together as one spot.