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Get Full Access to Introductory Chemistry - 5 Edition - Chapter 13 - Problem 127p
Get Full Access to Introductory Chemistry - 5 Edition - Chapter 13 - Problem 127p

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# What is the boiling point of an aqueous solution that freezes at ?6.7 °C? ISBN: 9780321910295 34

## Solution for problem 127P Chapter 13

Introductory Chemistry | 5th Edition

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Problem 127P

Problem 127P

What is the boiling point of an aqueous solution that freezes at −6.7 °C?

Step-by-Step Solution:
Step 1 of 3

Solution: Here, we are going to determine the boiling point.

Step1:

The depression of freezing point of a solution is calculated by the equation: Tf  = m x Kf                --------(1)

Where m is the molality of the solution  and Kf is the  freezing point depression constant for the solvent.

Similarly, the elevation of boiling  point of a solution is calculated by the equation: Tb = m x Kb        --------(2)

Where m is the molality of the solution  and Kb is the  boiling point elevation constant for the solvent.

Step2:

The freezing point of water = 0oC

Freezing point of the solution = -6.7oC

Therefore, depression in freezing point( Tf  ) =  0oC - (-6.7oC)

= 6.7oC

Freezing point depression constant for water(Kf) = 1.86oC kg mol-1

Substituting the values in equation (1), we get,

m = 6.7oC / 1.86oC kg mol-1

= 3.6 mol/kg

Step3:

Again, boiling point elevation constant of water(Kf) = 0.512oC kg mol-1

Substituting the values in equation (2), we get, Tb = 3.6 mol/kg x 0.512oC kg mol-1

= 1.8432oC

Step4: Tb = Tb - Tbo

Where, Tbo is the boiling point of the pure solvent.

For water, Tbo = 100oC

Therefore, boiling point of the solution = 100oC + 1.8432oC

= 101.8432oC

Thus, boiling point of the solution is 101.8432oC.

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Step 2 of 3

Step 3 of 3

##### ISBN: 9780321910295

Since the solution to 127P from 13 chapter was answered, more than 326 students have viewed the full step-by-step answer. This textbook survival guide was created for the textbook: Introductory Chemistry, edition: 5. The full step-by-step solution to problem: 127P from chapter: 13 was answered by , our top Chemistry solution expert on 05/06/17, 06:45PM. This full solution covers the following key subjects: aqueous, boiling, freezes, point, solution. This expansive textbook survival guide covers 19 chapters, and 2046 solutions. The answer to “What is the boiling point of an aqueous solution that freezes at ?6.7 °C?” is broken down into a number of easy to follow steps, and 14 words. Introductory Chemistry was written by and is associated to the ISBN: 9780321910295.

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