Required Practical 12 (AQA A-Level Chemistry): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What mass of aspirin powder should be dissolved in of ethanol?
What mass of aspirin powder should be dissolved in of ethanol?
How far above the bottom of the TLC plate should the pencil line be drawn?
How far above the bottom of the TLC plate should the pencil line be drawn?
Why must a pencil be used to mark the baseline on a TLC plate?
Why must a pencil be used to mark the baseline on a TLC plate?
It does not dissolve in the solvent
What volume of solvent should be poured into the development chamber?
What volume of solvent should be poured into the development chamber?
About
Why must the development chamber have a tight-fitting lid?
Why must the development chamber have a tight-fitting lid?
To prevent evaporation and saturate with vapour
Where should the solvent level be relative to the spots on the TLC plate?
Where should the solvent level be relative to the spots on the TLC plate?
Below the line of spots
When should the TLC plate be removed from the development chamber?
When should the TLC plate be removed from the development chamber?
When solvent is from top
Where should the TLC plate be dried after development?
Where should the TLC plate be dried after development?
In a fume cupboard
Why is a UV lamp used during TLC analysis?
Why is a UV lamp used during TLC analysis?
To detect colourless spots