dichloromethane layer into a clean 125 or 250 mL Erlenmeyer

Last updated: 9/6/2023

dichloromethane layer into a clean 125 or 250 mL Erlenmeyer flask Avoid collecting any of the aqueous upper layer or emulsion if present Repeat the process with an additional 30 mL of dichloromethane and add the new dichloromethane extract to the previously collected layer Add anhydrous magnesium sulfate or sodium sulfate to the combined dichloromethane extracts to remove traces of water The anhydrous magnesium sulfate sodium sulfate will absorb the small amount of water in the dichloromethane forming clumps Once all the water has been absorbed clumping will stop Gravity filter the DCM layer from the flask into a 100 ml pre weighed clean and dry round bottom flask Remove all dichloromethane by using evaporator Leave the crude caffeine in your drawer to air dry and get the weight of dry crude caffeine