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Volatile chemicals are often extracted into a water immiscible phase for analysis using gas chromatography. Consider...

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Chemistry

Volatile chemicals are often extracted into a water immisciblephase for analysis using gas chromatography. Consider benzene,which is mildly soluble (for an aromatic compound) in a watersample in a sealed 100-mL bottle containing 60 mL of water. Thebenzene has reached equilibrium between the two phases. Benzene hasa molecular weight of 78 g/mol, liquid density of 0.88 g/mL, vaporpressure of 0.125 atm. (which is equivalent to 405 mg/L), liquidactivity coefficient of 2.4 × 103 (25 °C and 1 atm), solubility of1780 mg/L and an octanol-water coefficient of log KBow=2.0.

a. Gas analysis shows that the headspace contains 1.95 mg/L ofbenzene. What is the concentration of benzene (mg/L) in thewater?

b. What is the total mass of benzene (mg) in the sealedbottle?

c. One mL of octanol is now added to the bottle. What is theresulting concentration of benzene in the water after equilibriumwith the octanol?

Answer & Explanation Solved by verified expert
4.4 Ratings (795 Votes)
The distribution ratio Kd can be determined by theformula XG XL where XG is theconcentration of benzene in gaseous state while XL isthe concentration of benzene in waterFor    See Answer
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