I have a result from an experiment that really bothers me, yet I found no sources online that can explain the situation.
While quinine is relatively soluble in ethanol because they are both non-polar. However, the result was not homogeneous. Even worse, the solution freezes when we left it sitting for a moment (it turns into solid mass), certainly not within our expectations. what we did was preparing 300 mg of quinine and dissolve it into 10 ml of ethanol and spin it in vortex spinner for 2 minutes.