After my hot acidic filtration under reduced pressure my crystals failed to form, I tried scratching the sides to no avail and even leaving it overnight does not form crystals, any idea what I can do to form crystals from the pure aspirin dissolved in ethanol?
ik it's a year later, but in the first step, i don't think you should dissolve the aspirin in hot acid, it should be dissolved in hot ethanol. maybe that's why the crystals didn't reform?
probably cold ethanol dissolves more of the soluble impurities than cold water, so you get more soluble impurities removed. since ethanol is a better solvent than water (but both don't dissolve the crystals)
