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level: Chemical analysis paper chromatography

Questions and Answers List

level questions: Chemical analysis paper chromatography

QuestionAnswer
Equation for Rf valuedistance travelled by substance/ distance travelled by solvent
What is chromatographyAnalytic technique used to separate different substances from mixtures
Paper chromatography experiment1) Take filter paper and draw a line near the bottom(baseline) 2) Add a sample of ink to the pencil line 3) Add a shallow amount of solvent to the beaker 4) Then place filter paper into solvent but make sure it doesn't submerge the pencil line 5) Wait for the solvent to seep up the paper, then the different dies which make up ink will dissolve and rise with it 6) Take out the paper and leave it to dry
How does each die travelAt different rates - each one must be a different substance
What is the mobile phasesubstances the molecules can move in e.g. liquid or gas
What is the stationary phaseSubstance the molecules cant move in e.g. viscous liquid or solid
Chemicals more soluble in solventSpend more time in mobile phase therefore moving faster
Chemicals less solublespend more time in stationary phase therefore moving more slowly
What is a reference substanceA pure sample that runs alongside the unknown mixture to see if its a component in the mixture