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Chromotography
Description
Mind Map on Chromotography, created by milliewernyj17 on 12/06/2013.
Mind Map by
milliewernyj17
, updated more than 1 year ago
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Created by
milliewernyj17
almost 11 years ago
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Resource summary
Chromotography
It is used to identify substances in a mixture
Different substances wash through wet filter paper at different rate
Method:
1. Draw a pencil baseline on filter paper and put dots of each mixture on the line
2. Roll up the piece of paper and put it in a beaker containing water
3. you must make sure the baseline is kept above water level
4. The water will seep up the paper, taking the water with it
5. The different chemicals on the paper separate different spots on the paper
6. The result of the chromatography test is called a chromatogram
A Chromatogram with 4 spots means there is at least 4 different substances in the sample mixture
Uses for this:
to separate out the mixture of colouring agents in food
You can calculate the Rf value for each chemical
Rf= Distance travelled by substance (e.g. food colouring) /distance travelled by solvent (e.g. water)
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