Reasons why a recrystallization process would not give a yield of 100%?
Answer:
This purification technique results in the inevitable loss of the part of the compound that remains in solution. A yield of 80% would be considered quite good.
You've got to use a solvent that you can remove nearly 100% of the chemical from. The solvent is always going to retain a little bit of the chemical even after you recrystalize, so you lose a bit. I've done full reactions with recrystalization and gotten over 98% yield. So it depends on the chemical, the reaction and the solvents used what kind of yield you will get. I'd say 95% is good, but some chemicals may not get better than 50% and you may need to deal with that just for the sake of obatining pure products.
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