Required Practical: Investigating Chromatography (OCR GCSE Chemistry A, Combined (Gateway Science Suite)): Flashcards

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Required Practical: Investigating Chromatography
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Purpose of paper chromatography

Separate & identify coloured chemicals in mixtures

Example mixture for paper chromatography

Black ink

Distance of pencil line from edge of paper

2 cm

Why use pencil not ink for the line

Ink would dissolve in the solvent

Depth of solvent in beaker

About 1 cm deep

Where to apply the ink drop

Centre of the pencil line

Key rule for ink spot and solvent

Ink spot must not touch the solvent

When to remove paper from beaker

When solvent front is 1 cm from top of paper

What to mark after removing paper

Solvent front line & circle ink spots

How to measure ink spot distance

From centre of each spot to starting line

RfRf value formula

Rf=spot distancesolvent distanceRf = \frac{\text{spot distance}}{\text{solvent distance}}

Purpose of RfRf value

Identifies different chemicals in the ink

Explore OCR GCSE Chemistry A, Combined (Gateway Science Suite) Revision Notes by Topics

Purity, Formulations & Chromatography

Identification of Common Gases

Explore OCR GCSE Chemistry A, Combined (Gateway Science Suite) Model Answers by Topics

Purity, Formulations & Chromatography

Identification of Common Gases

Explore OCR GCSE Chemistry A, Combined (Gateway Science Suite) Quizzes by Topics

Purity, Formulations & Chromatography

Identification of Common Gases

Explore OCR GCSE Chemistry A, Combined (Gateway Science Suite) Exam Questions by Topics

Purity, Formulations & Chromatography

Identification of Common Gases

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