You want to decaffeinate your coffee by extracting the caffeine outwith dichloromethane. It's too late to...

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Chemistry

You want to decaffeinate your coffee by extracting the caffeineoutwith dichloromethane. It's too late to extract the caffeinefromthe coffee beans because you've already brewed yourself a 200mL cupof coffee. Your particular brand of coffee contains100 mg ofcaffeine in that 200mL cup. The partitioncoefficient of caffeine indichloromethane/water is 9.0. How much caffeine would still be inyour 200 mL if you did: A. One extraction using 200 mLofdichloromethane B. Two extractions using 100 mL ofdichloromethaneach. Please show all steps! Thank you!

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4.0 Ratings (544 Votes)

Dear friend

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â [g/100 mL] in organic phase

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Partition coefficient (K) =Â Â Â Â Â Â Â Â ----------------------------------------------------

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â [g/100 mL] in aqueous phase

The partition coefficient of caffeine in dichloromethane/water is 9.0. it means for every 100 mL 90 mg caffeine goes into dichloromethane and 10 mg goes into water.

A. One extraction using 200 mL of dichloromethane ------Â Â 10 mg remains because 90 mg goes into 200 mL dichloromethane

B. Two extractions using 100 mL of dichloromethan each ------Â Â Â nothing remains because first 100 mL takes 90 mg then next 100 mL takes 10 mg into dichloromethane.

Thank you.

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