Chromatography

Question 1

what is chromatography

Answer 1

a tenchnique which can be used to separate the components of mixtures

Question 2

explain the how the 2 phases work

Answer 2

the phase flows through the stationary phase and carries the components of the mixture with it

Question 3

what does chromatography test

Answer 3

the difference in the abilities of components to dissolve in the mobile phase and the difference in abilities of components to stick fast to the solid SP

Question 4

how does this relate to IMFs

Answer 4

the more strongly a substance sticks to SP, the slow it moves in the direction of flow of MP this relates to the strength of IMF of attraction between solute and solvent

Question 5

for paper chrome was is the SP, MP and mixture

Answer 5

SP - paper
MP - water (solvent)
mixture - texta (solute)

Question 6

for gas chrome was is the SP, MP and mixture

Answer 6

SP - porous solide
MP - gas
Mixture - eg blood

Question 7

explain gas chrome and what results it gives

Answer 7

the time the mixture takes to travel through tube will depend on how much time is spent with gas rather than attached to liquid

Question 8

explain retention time

Answer 8

a component should always travel at the same speed, it’s identity can be found by comparing the distance it moves relative to the solvent

Question 9

what does retention time depend on

Answer 9

higher boiling point and greater solubility - long retention time