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OCR B A Level Chemistry > what's in a medicine > Flashcards

Flashcards in what's in a medicine Deck (5)
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1
Q

name a technique used to purify volatile liquids

A

redistillation

2
Q

how do you remove water from a purified product?

A

dry with an anhydrous salt

3
Q

how do you choose a solvent for re-crystallisation?

A

-solid must be very soluble in the hot solvent but nearly impossible when the solvent is cold

4
Q

how do you calculate an Rf value?

A

distance travelled by spot/distance travelled by solvent

5
Q

what are the uses for thin layer chromatography?

A
  • separating and identifying molecules

- purifying substances