Required Practical: Investigating Chromatography (OCR GCSE Chemistry A (Gateway Science Suite)): Flashcards
📚Flashcards
Practise the cards
12 cards from this deck
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Practise the cards
12 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
Why use pencil not ink for starting line
Why use pencil not ink for starting line
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 (must not touch it)
When to remove paper from beaker
When to remove paper from beaker
When solvent front is 1 cm from top of paper
What to mark after removing paper
What to mark after removing paper
The solvent front line
Where to measure spot distance from
Where to measure spot distance from
Centre of each spot
Rf value formula
Rf value formula
What Rf value identifies
What Rf value identifies
Different chemicals in the ink
Example mixture for paper chromatography
Example mixture for paper chromatography
Black ink
What to circle on chromatography paper
What to circle on chromatography paper
Original ink drop & separated ink spots