purification of an organic liquid

Question 1

steps for purification of an organic liquid?

Answer 1

-Put the distillate of impure product into a separating funnel

• wash product by adding either
- sodium hydrogencarbonate solution , shaking and
releasing the pressure from CO2 produced.

• or Saturated sodium chloride solution

•Allow the layers to separate in the funnel, and then run and
discard the aqueous layer.

•Run the organic layer into a clean, dry conical flask and add
three spatula loads of drying agent (anhydrous sodium
sulphate) to dry the organic liquid.

• Carefully decant the liquid into the distillation flask
• Distill to collect pure product

Question 2

why do you wash the organic liquid with Sodium hydrogencarbonate

Answer 2

Sodium hydrogencarbonate will

neutralise any remaining reactant acid

Question 3

why do you wash the organic liquid with Sodium chloride

Answer 3

Sodium chloride will help separate the

organic layer from the aqueous layer

Question 4

features of the drying agent

Answer 4

• be insoluble in the organic liquid

* not react with the organic liquid