consider an 11 g solid sample comprising 10 g A, the desired material, and 1 g...

[saun]

...B, an impurity? A and B have the same solubility behavior, independent of each other, in a solvent S. each dissolves to the extent of 10 g per 100 g in S hot and 2 g per 100 g in S cold. a)what is the minimum amount of hot S required to just dissolve the entire smaple? remember the solubilities are independent. b)if one cools the hot saturated solution from (a), how much of each substance precipitates? (once you get this answer, you have grasped the essence of the theory of elimination of a soluble impurity.) c) after filtration from the solid of (b), how much of the S, A and B remain in the filtrate? d) can you squeeze any more pure anything out of this filtrate? assume you cannot get below the temperature "cold" but that S is volatile. e) is there any point in further processing the filtrate from (d) in an attempt to get more pure material to crystallize? explain why or why not. f) from the last filtrate boiled to dryness, what would one now need to get some pure B by recrystallization?