what's in a medicine Flashcards
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
