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Paper 2
Chemical Analysis
Chromatography
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Cards (9)
What are the 2 phases of Chromatography ?
The
stationary
phase and the
mobile
phase
What is the stationary phase of Chromatography?
The phase that does not
move
What is the mobile phase of Chromatography?
The phase that
moves
In paper Chromatography, what is the stationary phase?
The
absorbent
paper
In paper Chromatography, what is the mobile phase?
The
solvent
(Often water)
What does Chromatography do?
It separates
mixtures
into their constituent
components
Name a use of chromatography?
It can be used to identify artificial
colours
in
food
(By comparing them to results obtained from known substances)
What is the equation for Retention Factor / Rf value ?
distance moved by
substance
/ distance moved by
solvent
How can we use Rf to identify a component?
As long as the
temperature
and same
solvent
are used, A components Rf value remains
constant
- and can be used to identify the component