Racemic ibuprofen 16 mmol is dissolved in 0,24 M KOH 7,92 mmol. A magnet is added and the mixture is heated to 75-85 degrees. When everything is dissolved,
(S)-(-)-1-phenylethylamine(1,0 mL) is added and we had to keep stirring for an hour.
Afterwards the Recrystallization procedure occurs ...
The next day we used the crystals and added 2M sulfuric acid(25 mL), ethyl acetate (15 mL) and a magnet etc .
We ended with a thick oil and had to measure the melting point.
I understand why (S)-(-)-1-phenylethylamine is added, however stille not sure on the KOH and can't answer the question yet. I wrote earlier that adding KOH would make the process more soluble.
Also, It's also possible to add for example (R)-(-)-1-phenylethylamine and it would have turned out the same, right?