Question

During Caffeine extraction and purification under the workflow of; steeping tea, L-L extraction, Add NaOH, dry, use roto-vap, recrystallization, and then recovering the crystals with dichloromethane what could be some potential reasons for caffeine loss when comparing to theoretical yield (0.034g) and what can be some possible reasons for the crude yield weighing in higher (0.05g) than the expected theoretical yield therefore giving an above 100 percent yield after doing the exact calculation

Answer 1

Reasons for caffeine loss

1. If solvent used for recrystallization is in large amount then there is poor yield