Question

An impure 7.53g sample of (S)-ibuprofen was found in a container. The conclusion that the material was impure was based upon the observation of black colored particulate in the sample. The sample was recrystallized from a water methanol mix of solvents to yield 5.23g of material with a melting point of 76-79 degrees celsius. Answer the following questions:

a) was the isolated material pure? explain.

b) What was the percent recovery of (S)-ibuprofen from the original sample?

Answer 1

A) yes

Melting point of ibuprofen : 75 - 78 degree celcius

The observed melting point in the expected range. Therefore , the obtained compound is pure ibuprofen

B. % recovery = 5.23 / 7.53 *100

= 69.5 %