Class 12 Exam > Class 12 Questions > Calculate the freezing point of a solution co...
Start Learning for Free
Calculate the freezing point of a solution containing 8.1 g of HBr in 100 g of water, assuming the acid to be 90 % ionized. [Given: Molar mass Br = 80 g/mol, Kf water = 1.86 K kg / mol]?
Most Upvoted Answer
Calculate the freezing point of a solution containing 8.1 g of HBr in ...
Step 1: Calculate Moles of HBr
To find the moles of HBr in the solution, we first need to determine its molar mass:
- Molar mass of H = 1 g/mol
- Molar mass of Br = 80 g/mol
- Molar mass of HBr = 1 + 80 = 81 g/mol
Now, calculate the moles of HBr:
- Moles of HBr = mass / molar mass
- Moles of HBr = 8.1 g / 81 g/mol = 0.1 mol
Step 2: Calculate Ionization
Since HBr is 90% ionized:
- Ionized HBr = 0.1 mol × 0.90 = 0.09 mol
- Total particles (considering it dissociates into H⁺ and Br⁻):
Total = 0.09 mol H⁺ + 0.09 mol Br⁻ = 0.18 mol
Step 3: Calculate Molality
To find molality (m):
- Mass of water = 100 g = 0.1 kg
- Molality (m) = moles of solute / mass of solvent (kg)
- m = 0.18 mol / 0.1 kg = 1.8 mol/kg
Step 4: Calculate Freezing Point Depression
Using the formula for freezing point depression:
- ΔTf = Kf × m
- ΔTf = 1.86 K kg/mol × 1.8 mol/kg = 3.348 K
Step 5: Calculate Freezing Point of the Solution
The freezing point of pure water is 0°C. Therefore:
- Freezing point of solution = 0°C - ΔTf
- Freezing point of solution = 0°C - 3.348 K = -3.348°C
Final Result
The freezing point of the solution containing 8.1 g of HBr in 100 g of water, assuming 90% ionization, is approximately -3.35°C.
To find the moles of HBr in the solution, we first need to determine its molar mass:
- Molar mass of H = 1 g/mol
- Molar mass of Br = 80 g/mol
- Molar mass of HBr = 1 + 80 = 81 g/mol
Now, calculate the moles of HBr:
- Moles of HBr = mass / molar mass
- Moles of HBr = 8.1 g / 81 g/mol = 0.1 mol
Step 2: Calculate Ionization
Since HBr is 90% ionized:
- Ionized HBr = 0.1 mol × 0.90 = 0.09 mol
- Total particles (considering it dissociates into H⁺ and Br⁻):
Total = 0.09 mol H⁺ + 0.09 mol Br⁻ = 0.18 mol
Step 3: Calculate Molality
To find molality (m):
- Mass of water = 100 g = 0.1 kg
- Molality (m) = moles of solute / mass of solvent (kg)
- m = 0.18 mol / 0.1 kg = 1.8 mol/kg
Step 4: Calculate Freezing Point Depression
Using the formula for freezing point depression:
- ΔTf = Kf × m
- ΔTf = 1.86 K kg/mol × 1.8 mol/kg = 3.348 K
Step 5: Calculate Freezing Point of the Solution
The freezing point of pure water is 0°C. Therefore:
- Freezing point of solution = 0°C - ΔTf
- Freezing point of solution = 0°C - 3.348 K = -3.348°C
Final Result
The freezing point of the solution containing 8.1 g of HBr in 100 g of water, assuming 90% ionization, is approximately -3.35°C.
Community Answer
Calculate the freezing point of a solution containing 8.1 g of HBr in ...
-3.534 degree Celsius
|
Explore Courses for Class 12 exam
|
|
Similar Class 12 Doubts
Calculate the freezing point of a solution containing 8.1 g of HBr in 100 g of water, assuming the acid to be 90 % ionized. [Given: Molar mass Br = 80 g/mol, Kf water = 1.86 K kg / mol]?
Question Description
Calculate the freezing point of a solution containing 8.1 g of HBr in 100 g of water, assuming the acid to be 90 % ionized. [Given: Molar mass Br = 80 g/mol, Kf water = 1.86 K kg / 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 Calculate the freezing point of a solution containing 8.1 g of HBr in 100 g of water, assuming the acid to be 90 % ionized. [Given: Molar mass Br = 80 g/mol, Kf water = 1.86 K kg / mol]? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Calculate the freezing point of a solution containing 8.1 g of HBr in 100 g of water, assuming the acid to be 90 % ionized. [Given: Molar mass Br = 80 g/mol, Kf water = 1.86 K kg / mol]?.
Calculate the freezing point of a solution containing 8.1 g of HBr in 100 g of water, assuming the acid to be 90 % ionized. [Given: Molar mass Br = 80 g/mol, Kf water = 1.86 K kg / 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 Calculate the freezing point of a solution containing 8.1 g of HBr in 100 g of water, assuming the acid to be 90 % ionized. [Given: Molar mass Br = 80 g/mol, Kf water = 1.86 K kg / mol]? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Calculate the freezing point of a solution containing 8.1 g of HBr in 100 g of water, assuming the acid to be 90 % ionized. [Given: Molar mass Br = 80 g/mol, Kf water = 1.86 K kg / mol]?.
Solutions for Calculate the freezing point of a solution containing 8.1 g of HBr in 100 g of water, assuming the acid to be 90 % ionized. [Given: Molar mass Br = 80 g/mol, Kf water = 1.86 K kg / 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 Calculate the freezing point of a solution containing 8.1 g of HBr in 100 g of water, assuming the acid to be 90 % ionized. [Given: Molar mass Br = 80 g/mol, Kf water = 1.86 K kg / mol]? defined & explained in the simplest way possible. Besides giving the explanation of
Calculate the freezing point of a solution containing 8.1 g of HBr in 100 g of water, assuming the acid to be 90 % ionized. [Given: Molar mass Br = 80 g/mol, Kf water = 1.86 K kg / mol]?, a detailed solution for Calculate the freezing point of a solution containing 8.1 g of HBr in 100 g of water, assuming the acid to be 90 % ionized. [Given: Molar mass Br = 80 g/mol, Kf water = 1.86 K kg / mol]? has been provided alongside types of Calculate the freezing point of a solution containing 8.1 g of HBr in 100 g of water, assuming the acid to be 90 % ionized. [Given: Molar mass Br = 80 g/mol, Kf water = 1.86 K kg / mol]? theory, EduRev gives you an
ample number of questions to practice Calculate the freezing point of a solution containing 8.1 g of HBr in 100 g of water, assuming the acid to be 90 % ionized. [Given: Molar mass Br = 80 g/mol, Kf water = 1.86 K kg / 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.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup