Distribution Law
Iodine distributes itself between water and CCl₄ with a distribution coefficient of 85. If 1 g of I₂ is shaken with 100 mL each of water and CCl₄, the amount of I₂ in CCl₄ layer is approximately:
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About This Question
- Subject
- chemistry
- Chapter
- solutions
- Topic
- distribution law
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
0.99 g
Using the Nernst Distribution Law:
- K=CaqueousCorganic=85.
- Let x g of I2 be in CCl4 and (1−x) g be in water.
- Concentrations (since volumes are equal 100 mL): x/100 and (1−x)/100.
- Equation: 85=1−xx
- 85−85x=x⇒86x=85⇒x=8685≈0.988 g.
- Thus, nearly all the iodine (0.99 g) moves into the organic layer due to its high solubility there.
This medium difficulty chemistry question is from the chapter solutions, covering the topic of distribution law. It appeared in the 2025 exam.
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