The distribution coefficient, KD (ether/water), between ether and water for aspirin at room temperature is 3.5. What weight of aspirin would be extracted by a single extraction with 60 ml of water from a solution of 10 grams of aspirin in 100 ml of ether?  Calculate  the  weight  of  aspirin  which  would  be  removed  by  three extractions with 20 ml portions of water.

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