lesson 6 paper chromotography Flashcards
all separation techniques are what type of processes
physical processes
all separation techniques being physical processes means what
they do not involve chemical reactions and no new substances are made
paper chromatography allows us to what
separate substances based on their different solubilities
if you have a collection of coloured pens what do you want to know (example)
which pens contain only one colour and which pens contain a mixture of colours
what do we do first during paper chromatography
take a piece of special paper called chromatography paper
what do we do with the paper chromatography paper
draw a pencil line near the bottom of the paper
after we draw a pencil line near the bottom of our paper what do we do
put a dot of our 1st colour on the pencil line and next to it we put a dot of our 2nd colour
how much dots of colour can we put on the paper
as much as you want as long as it fits
once we have drawn our dots on the paper what do we do
place the bottom of the paper into a solvent
what is a solvent
a liquid that will dissolve substances
once we put the bottom of our paper into the solvent then what occurs
the solvent now makes it way up the paper
once the solvent makes its way up the paper what occurs
it dissolves the ink in the two colour dots
once the solvent has dissolved the ink in the two colour dots what occurs
the ink is carried up the paper dissolved in the solvent
what do we call the paper
the stationary phase
(as it does not move)
what do we call the solvent
the mobile phase
(as it moves)
after a while the paper could cause the red colour (colour red) to form what (example)
a single spot
because the red(colour A) has only one spot, what does that mean (example)
it is a single pure colour
we can see that the colour yellow (colour B) has separated into what (example)
two different spots
as we can see the colour yellow (colour B) has formed two different spots what does that mean (example)
that it was actually a mixture of two different colours
a pure compound will produce what
a single spot in all solvents
the compounds in a mixture may separate into what
different spots depending on the solvent
a different solvent may what
change the position of the spots
why does paper chromatography work
because different substances have different solubilities
a more soluble substance if more attracted to the what
mobile phase
(the solvent, than a less soluble substance)
a more soluble substance travels further than a…
less soluble substance
why do we draw our starting line in pencil
because if we drew the line in pen it could dissolve in the solvent and move up the paper
