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15 February, 00:47

In this experiment, 0.070 g of caffeine is dissolved in 4.0mL of water. The caffeine is extracted from the aqueous solution three times with 2.0-mL portions of methylene chloride. Calculate the total amount of caffeine that can be extracted into the three portions of methylene chloride (see Technique12, Section12.2). Caffeine has a distribution coefcient of 4.6, between methylene chloride and water.

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  1. 15 February, 00:54
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    0.068 g

    Explanation:

    The equation that is used to determine the fraction q remaining in water of volume V₁ after n extractions of volume V₂ is:

    qⁿ = (V₁ / (V₁ + KV₂)) ⁿ

    Substituting in the values gives the fraction of caffeine left in the water phase:

    q³ = (4.0mL / (4.0mL + 4.6 (2.0mL)) ³ = 0.0278

    The fraction of caffeine extracted into the methylene chloride phase is:

    1 - 0.0278 = 0.972

    The amount of caffeine extracted into the methylene chloride is:

    (0.070g) (0.972) = 0.068 g
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