Composition Of Ink Using Paper Chromatography

Question 1

Why is it important to draw the lines and write the labels on chromatography paper in pencil and not ink?

Answer 1

Pencil is insoluble in the solvent whereas an ink line would separate

Question 2

Why should the spots of ink be above the level of solvent in the beaker

Answer 2

To prevent the ink running into the water

Question 3

What is meant by the term “solvent front”

Answer 3

The level reached by the solvent on the paper

Question 4

What would happen if you used permanent ink instead of water solution?
How could you overcome this problem

Answer 4

There would be a spot on the line after chromatography

Use a different solvent

Question 5

Which is the mobile phase? Which is the stationary phase?

Answer 5

The mobile phase is the solvent, the stationary phase is the paper

Question 6

Which inks if any contains one dye?
Which inks are mixtures of dyes?
Which inks contain the same dye?

Answer 6

An ink will have a spot for each different due in it. A mixture of ink will have more than one spot. Spots that are on the same horizontal line contain the same dye

Question 7

Rf value =

Answer 7

D (solute) / D (solvent)