Class 12 Exam  >  Class 12 Questions  >  What is the freezing point of 0.4molal soluti... Start Learning for Free
What is the freezing point of 0.4molal solution of acetic acid in benzene in which it dimerises to the extent of 85%.freezing point of benzene is 278.4k and its molar heat of fusion is 10.042U/mol.?
Most Upvoted Answer
What is the freezing point of 0.4molal solution of acetic acid in benz...
Freezing Point Depression Concept
The freezing point depression of a solution can be calculated using the formula:
ΔTf = Kf * m * i
Where:
- ΔTf = change in freezing point
- Kf = freezing point depression constant of the solvent
- m = molality of the solution
- i = van't Hoff factor (degree of dissociation)
Given Data
- Freezing point of benzene (Tf) = 278.4 K
- Molar heat of fusion of benzene = 10.042 U/mol
- Molality of acetic acid solution = 0.4 molal
- Degree of dimerization = 85%
Calculation of Van't Hoff Factor (i)
Since acetic acid (CH3COOH) dimerizes to form (CH3COOH)2, the extent of dimerization affects the van’t Hoff factor:
- Initial moles of acetic acid = 0.4
- Dimerization = 85%
- Moles after dimerization = 0.4 * (1 - 0.85) + 0.4 * 0.85 / 2 = 0.4 * 0.15 + 0.4 * 0.425 = 0.06 + 0.17 = 0.23
Thus, the van’t Hoff factor (i) ≈ 1.73 (because 0.4 moles produce 0.23 effective moles).
Freezing Point Depression Calculation
- Kf for benzene = 5.12 K kg/mol (standard value).
- ΔTf = Kf * m * i = 5.12 * 0.4 * 1.73 ≈ 3.55 K.
Final Freezing Point
- Final freezing point = Initial freezing point - ΔTf
= 278.4 K - 3.55 K ≈ 274.85 K.
Conclusion
The freezing point of the 0.4 molal acetic acid solution in benzene, accounting for 85% dimerization, is approximately 274.85 K.
Community Answer
What is the freezing point of 0.4molal solution of acetic acid in benz...
Whats the answer?
Explore Courses for Class 12 exam
What is the freezing point of 0.4molal solution of acetic acid in benzene in which it dimerises to the extent of 85%.freezing point of benzene is 278.4k and its molar heat of fusion is 10.042U/mol.?
Question Description
What is the freezing point of 0.4molal solution of acetic acid in benzene in which it dimerises to the extent of 85%.freezing point of benzene is 278.4k and its molar heat of fusion is 10.042U/mol.? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about What is the freezing point of 0.4molal solution of acetic acid in benzene in which it dimerises to the extent of 85%.freezing point of benzene is 278.4k and its molar heat of fusion is 10.042U/mol.? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is the freezing point of 0.4molal solution of acetic acid in benzene in which it dimerises to the extent of 85%.freezing point of benzene is 278.4k and its molar heat of fusion is 10.042U/mol.?.
Solutions for What is the freezing point of 0.4molal solution of acetic acid in benzene in which it dimerises to the extent of 85%.freezing point of benzene is 278.4k and its molar heat of fusion is 10.042U/mol.? in English & in Hindi are available as part of our courses for Class 12. Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free.
Here you can find the meaning of What is the freezing point of 0.4molal solution of acetic acid in benzene in which it dimerises to the extent of 85%.freezing point of benzene is 278.4k and its molar heat of fusion is 10.042U/mol.? defined & explained in the simplest way possible. Besides giving the explanation of What is the freezing point of 0.4molal solution of acetic acid in benzene in which it dimerises to the extent of 85%.freezing point of benzene is 278.4k and its molar heat of fusion is 10.042U/mol.?, a detailed solution for What is the freezing point of 0.4molal solution of acetic acid in benzene in which it dimerises to the extent of 85%.freezing point of benzene is 278.4k and its molar heat of fusion is 10.042U/mol.? has been provided alongside types of What is the freezing point of 0.4molal solution of acetic acid in benzene in which it dimerises to the extent of 85%.freezing point of benzene is 278.4k and its molar heat of fusion is 10.042U/mol.? theory, EduRev gives you an ample number of questions to practice What is the freezing point of 0.4molal solution of acetic acid in benzene in which it dimerises to the extent of 85%.freezing point of benzene is 278.4k and its molar heat of fusion is 10.042U/mol.? tests, examples and also practice Class 12 tests.
Explore Courses for Class 12 exam
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev