You have a sample of 90 mL cola drink that contains 50 mg of dissolved caffeine. Calculate the total mass of caffeine extracted using 54 mL of dichloromethane in each of the following procedures: the entire volume of dichloromethane is used in one step; the dichloromethane is divided into two (27 mL) portions in a two-step extraction and into three (18 mL) portions in a three-step extraction. Please use two decimal places.

You have a sample of 90 mL cola drink that contains 50 mg of dissolved caffeine. Calculate the total mass of caffeine extracted using 54 mL of dichloromethane in each of the following procedures: the entire volume of dichloromethane is used in one step; the dichloromethane is divided into two (27 mL) portions in a two-step extraction and into three (18 mL) portions in a three-step extraction. Please use two decimal places.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

You have a sample of 90 mL cola drink that contains 50 mg of dissolved
caffeine. Calculate the total mass of caffeine extracted using 54 mL of
dichloromethane in each of the following procedures: the entire volume of
dichloromethane is used in one step; the dichloromethane is divided into
two (27 mL) portions in a two-step extraction and into three (18 mL)
portions in a three-step extraction. Please use two decimal places.
Number of
extraction steps
One Step
Two Steps
Three Steps
Extracted caffeine
mass (mg)
(Submit)

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Step 1: Single-step extraction uses all 54 ml of dichloromethane, extracting half the caffeine (25 mg).

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Step 2: In two steps, 27 mL of dichloromethane each extracts half of the caffeine, totaling 100 mg.

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Step 3: In three steps, 20 mL of dichloromethane each extracts one-third of the caffeine, totaling 50 mg.

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