paper chromatography

Question 1

what does paper chromatography allow us to do?

Answer 1

it allows us to separate substances based on their different solubilities

Question 2

what is a solvent

Answer 2

a liquid that dissolves substances

Question 3

what does a pure chemical produce in chromatography

Answer 3

it will produce a single spot on the paper in all solvents

Question 4

why is the starting line/base line drawn in pencil

Answer 4

if it was in pen, the pen ink would move up the paper with the solvent

Question 5

how is chromatography done

Answer 5

1) get filter paper and draw base line in pencil
2) place dot of ink on base line
3) get beaker with solvent in it, place filter paper making sure base line is not submerged
4)wait for solvent to seep up the filter paper
5)dyes in ink dissolves in the solvent and moves up paper with the solvent

once solvent has nearly reached top of paper, take it out and leave it to dry, the pattern left on the paper is called the chromatogram

Question 6

what is the mobile phase?

Answer 6

a substance that molecules can move in
is usually a liquid or gas

Question 7

what is the stationary phase?

Answer 7

substance or material that molecules cant move in
solid, thick liquid, paper

Question 8

the equation for the Rf value

Answer 8

distance travelled by the solvent