Question

1. An analyte has a partition coefficient of 2.0 between water and 1-pentanol. Given that 200 mL of a 5 % EtOH solution in water was extracted with 1-pentanol, calculate the fraction q of the analyte remaining in the aqueous phase (a) if one extraction of 200 mL is performed and (b) ten extractions of 100 mL are performed. (Hint: see page 49 in the manual. 2. For both 1a and 1b now calculate the Extraction Efficiency as a percentage

Answer 1

Ws Griven " in thut Solution Thase 6ne→ aqueous a) Dne oo m Fraution Prebsent in aqeou phes eous bhase extracthion Na Veng) hase 000 + 2 (20°) aq veous cient For ten extracions b) a4

An tras ered to Se cond phae lorqanic Frachon in organit hse Lkhachon efficiency in % 20. 33 33 eu 3 -9) x lo0 .3333) xIo e 66. G7 99.9013 %