Required Practical 12 (AQA A-Level Chemistry): Flashcards

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Required Practical 12
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Mass of aspirin powder dissolved in ethanol

0.1 g

Distance of baseline above bottom of TLC plate

1 cm

Why use pencil for TLC baseline?

Does not dissolve in solvent

Why make small, concentrated spots on TLC?

To prevent spots from merging

Volume of solvent for TLC chamber

About 10 cm³

Why must solvent level be below spots?

Could dissolve the spots

Why use lid on TLC chamber?

Prevents evaporation & ensures vapour saturation

When to remove TLC plate from solvent?

When solvent is 1 cm from top

Formula for RfR_f value

Rf=component distancesolvent distanceR_f = \frac{\text{component distance}}{\text{solvent distance}}

Why use UV lamp on TLC plate?

Detect colourless spots

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