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481275
Paper Chromatography
Description
Mind Map on Paper Chromatography, created by sarahyeoh on 14/01/2014.
Mind Map by
sarahyeoh
, updated more than 1 year ago
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Created by
sarahyeoh
over 10 years ago
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Resource summary
Paper Chromatography
What is paper chromatography?
is a technique of using a solvent to separate a mixture into its components for identification purposes and determining of purity.
very useful method to separate and identify components in a sample like dyes in inks, poison in drugs etc.
Process: 1.a pencil line is drawn across the chromatography paper to indicate the starting position of mixture spots.
2. important to use a pencil because inks will sumuge
3. Paper dipped into a solvent
mixture dissolve in the solvent and moves up the paper
results:
How does it work?
http://www.youtube.com/watch?v=PN5YiY0Wm6o
http://www.youtube.com/watch?v=gpFb635N2wo
How to identify colourless substances?
Apply a locating agent on the chromatogram
agents react with the substances to produce a coloured substance
applications of chromatography
separate and identify dyes and drugs
identify chemicals sprayed on vegetables
determine purity of a sample
Advantages of chromatography
allow analysis if a tiny amount of chemicals
sensitive and highly reproducible
allow analysis of many samples in a time.
How do we interpret the result of chromatography?
If the chromatogram shows food colouring is a mixture of 2 dyes, It is not pure.
But is there is only one spot, it means it is pure,
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