Required Practical: Investigating Chromatography (AQA GCSE Chemistry): Flashcards
📚Flashcards
Practise the cards
10 cards from this deck
ShowHide
Practise the cards
10 cards from this deck
Purpose of paper chromatography
Purpose of paper chromatography
Separates & identifies coloured chemicals in mixtures
Distance of pencil line from edge of paper
Distance of pencil line from edge of paper
2 cm from short edge
Reason to use pencil not ink for baseline
Reason to use pencil not ink for baseline
Ink would dissolve in the solvent
Depth of solvent in beaker
Depth of solvent in beaker
About 1 cm deep
Position of ink spot relative to solvent
Position of ink spot relative to solvent
Just above solvent surface, not touching it
When to remove paper from beaker
When to remove paper from beaker
When solvent front about 1 cm from top
Solvent front
Solvent front
Where the solvent stopped moving
Measuring ink spot distance travelled
Measuring ink spot distance travelled
From centre of each spot
Formula for Rf value
Formula for Rf value
Purpose of Rf value
Purpose of Rf value
Identifies chemicals by how far they moved vs solvent