Organic Planning

Question 1

Apparatus req

Answer 1

Heating mantle

Round bottom flask

Liebig condenser

Clamps

Question 2

Flow of water?

Answer 2

| -> out 
        |
        |
->in|
       |

Question 3

Procedures for rn

Answer 3

Weight accurately X g of -RCOOH in a DRY around bottom flask in a weighting balance;

Clamp in cold water;

Y cm3 of B from a dropping funnel, DROP BY DROP into the contents of the round-bottom flask w constant stirring;

8-9 drops of catalyst;

Replace cold water bath w heating mantle; attach a liebag condenser on top of the round bottom flask;

Slowly increase the power of heating mantle; bring the rn mixture to a gentle boil; reflux mixture for 15 mins;

After 15mins, switch off heating mantle; allow condensate in condenser to drain back into flask; content cook back to rtp;

Remove heating mantle and replace with cold bath;

Add 2-3cm3 of H2O drop by drop into round bottom flask using a dropper; content cool back to rtp

Pour content into abt 50 cm3 of cold water in a 250cm3 beaker

Question 4

Describe purification

Answer 4

Filter the mixture;

Wash (s) on filter paper once w H2O;

Make a hole on filter paper w glass rod, wash down all (s) w hot ethanol into a clean 100cm3 conical flask;

Dissolve the solid using a min amt of hot ethanol;

Filter the hot solution into another clean 100cm3 conical flask;

Add hot water slowly to the sol until (s) separate out; warm the mixture until a clear sol is obtained again;

Cool the sol to obtain the crystallized solid;

Filter the recrystallized (s), wash w H2O;

dry the (s) by pressing it under several layers of filter paper;

Measure MP; check purity of aspirin obtained