chromatography

Question 1

chromatography works because…

Answer 1

different substances have different solubility in a solvent

Question 2

if colour doesnt move up paper during chromotography…

Answer 2

-try a different paper
-try a different solvent

Question 3

during chromatography, if the dye has not moved it is ______

Answer 3

insoluble

Question 4

during chromatography, if the dye has moved far up the paper it is ______

Answer 4

very soluble

Question 5

during chromatography, if the dye has moved the shortest distance it is ______

Answer 5

not very soluble/ the least soluble

Question 6

why do you put a lid on top when doing a chromatography practical?

Answer 6

prevents evaporation of solvent

Question 7

why do you draw the base line in pencil when doing a chromatography practical?

Answer 7

insoluble in solvent (inkline would disolve in solvent/ move up the paper)

Question 8

how to calculate the Rf value for chromatography?

Answer 8

spot distance
________________
solvent distance