Why is the solid product washed with ice-cold solvent during in the last stages of recrystallisation? Is this to remove soluble impurities? (for example) Well, what if the impurities were also insoluble in the cold solvent?
Recrystallisation is weird in the sense that we have to make some assumptions in order for the process to fulfilfulfill the 'ideal' purification of the solid product that we're trying to get to.
For example, we have to assume that all soluble impurities are washed off during suction filtration, and that no impurities manage to creep up within the molecules of the crystals when they form. Would I be correct in saying this?