Question

Order the steps of the isolation of caffeine. Please note that passive pass tense is used in the experimental section. (First step, second step, third step - ninth step)

Once caffeine began subliming, a cold finger was inserted.

The mixture was pressed with a rubber sheet to squeeze all the liquid out.

The mixture was brought to a mild boil.

To a 250 mL round bottom flask was added 100 mL of water, 5 tea bags, and 5 g of calcium carbonate.

After 20 minutes, the mixture was vacuum filtered.

The caffeine was scratched off the cold finger and weighed.

The solvent was evaporated in a beaker previously fit to a cold finger.

The filtrate was cooled in an ice bath.

The aqueous phase was extracted with 4 x 10 mL of dichloromethane.

Answer 1

Step 1 To a 250 mL round bottom flask was added 100 mL of water, 5 tea bags, and 5 g of calcium carbonate.

Step 2 the mixture was brought to a mild boil.

Step 3 The mixture was pressed with a rubber sheet to squeeze all the liquid out

Step 4 After 20 minutes, the mixture was vacuum filtered.

Step 5 The filtrate was cooled in an ice bath.

Step 6 The aqueous phase was extracted with 4 x 10 mL of dichloromethane.

Step 7. The solvent was evaporated in a beaker previously fit to a cold finger.

Step 8 Once caffeine began subliming, a cold finger was inserted.

Step 9 The caffeine was scratched off the cold finger and weighed.