Composition Of Ink Using Paper Chromatography Flashcards
Why is it important to draw the lines and write the labels on chromatography paper in pencil and not ink?
Pencil is insoluble in the solvent whereas an ink line would separate
Why should the spots of ink be above the level of solvent in the beaker
To prevent the ink running into the water
What is meant by the term “solvent front”
The level reached by the solvent on the paper
What would happen if you used permanent ink instead of water solution?
How could you overcome this problem
There would be a spot on the line after chromatography
Use a different solvent
Which is the mobile phase? Which is the stationary phase?
The mobile phase is the solvent, the stationary phase is the paper
Which inks if any contains one dye?
Which inks are mixtures of dyes?
Which inks contain the same dye?
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
Rf value =
D (solute) / D (solvent)
