Chromotography

Question 1

stationary phase

Answer 1

a solid or liquid that the mixture can travel across. the more attracted a portion of the mixture is then the slower it moves

Question 2

mobile phase

Answer 2

a liquid or gas that flows across the stationary phase and carries the components of the mixture with it. the more soluble the faster it moves

Question 3

separation of a mixture depends on

Answer 3

the solubility in the mobile phase and the attraction to the stationary phase

Question 4

attraction depends on

Answer 4

polarity

Question 5

TLC stationary and mobile phase

Answer 5

stationary- polar silica gel
mobile- non polar liquid solvent

Question 6

TLC method

Answer 6

pencil line 1cm
small drop of sample on line
stand plate in a beaker containing small amount of solvent (level must be below the pencil line)
cover beaker so solvent doesn’t evaporate
allow solvent to travel up
remove plate when solvent has travelled 1cm below top
let plate dry
spray with ninhydrin

Question 7

TLC developing agent

Answer 7

ninhydrin

Question 8

Rf

Answer 8

distance travelled by spot/ distance travelled by solvent front

Question 9

column chromatography stationary and mobile phases

Answer 9

stationary- polar silica gel
mobile- non polar liquid solvent

Question 10

solvent is known as what in column chromatography

Answer 10

eluent

Question 11

gas-liquid chromatography stationary and mobile phases

Answer 11

stationary- thick viscous liquid (non-polar) or silica gel coated on lining of column
mobile- inert gas

Question 12

what is recorded by gas-liquid chromatography

Answer 12

retention time

Question 13

how to find the amount of each component in gas-liquid

Answer 13

the area under the peak on the graph