Purifying organic compounds - recrystallisation?

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Bertybassett
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Report Thread starter 3 years ago
#1
Hello, I'm slightly confused firstly as to how recrystallisation works as a purifying technique and why we use it? So if we add hot solvent to the impure solid until it dissolves, and then leave it too cool, why and how does the solid that we want form crystals while the impurities are left and don't?


Also, why can't we just use a separating funnel to purify as if the product is insoluble in water, surely we can just remove all of the water soluble impurities by this method?


Many thanks
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