preparation of aspirin

What do u add and how much do u add and what do u mix it with

You add 2g of 2-hydroxybenzoic acid and mix it with 4cm3 of ethanoic anhydride to a flask

What do u add before u fit the flaks in reflux condenser

You add 5 drops of phosphoric acid and swirl

How long do u heat under reflux for

5 minutes

Using a water bath

What do u add whilst refluxing

You add 2cm3 of water down condesor

What do u do when the vigorous reaction ends

When the vigorous reaction ends - pour mixture into cold water in 100cm3 beaker

What do u do once the mixture is in a beaker o f cold water and what are the final steps to take

What do u do differently in recrystallisation

Stir and leave to stand in ice bath

Collec with suction filtration and wash with water

Then do recrystallisation but right at the start add ethanol to the hot solvent

Why is ethanoic anhydride used instead of acid chloride

Cheaper

Less corrosive

Less vulnerable to hydrolysis

What happens to the excess ethanoic anhydride

It’s hydrolysed