I have already asked a similar question on titrations before. In a few months, I have a test on chemical synthesis. It is marked on the percentage yield, purity and crystal size of the product. I do not have a lot experience in doing synthesises and I am looking for any tips that will help maximise the yield, purity and crystal size of my synthesis.
Most of the synthesis that we do, the products are obtained by recrystallisation. The solid is dissolved in a solvent at a high temperature and then it is placed in a cool bath. Then the product will crystallize on the bottom of the beaker.
Reading through an analytical textbook, it states a few ways to improve yield and purity but it doesn't actually state how you would do it practically:
- allow the solution cool down as slowly as possible. This will maximise crystal size.
maintain a low relative supersaturation of the solution, this will increase crystal size and improve purity
describes the process or digestion or Ostwald ripening where larger crystals grow at the expense of smaller crystals
Does anyone have any suggestions on how I would actually do these 3 above tips. Also does anyone have any other tips.