Question

An aqueous solution of NaCl has boiling point of 102.42 oC. What is the corresponding freezing...

An aqueous solution of NaCl has boiling point of 102.42 oC. What is the corresponding freezing point of this solution?
a) -2.42 °C
b) -8.77 °C
c) 8.60 °C
d) 2.42 °C

Homework Answers

Answer #1

An aqueous solution of NaCl has boiling point, Tb = 102.42 oC and also we know that the boiling point constant, Kb of water is 0.512 oC/molal.

Using the formula, we can calculate the molality of the given NaCl solution.

  , where, Tb*= 100 oC

vant's Hoff factor, i = 2, NaCl completely dissociates into two ions

Now by putting the values,

  

  

  

We can now calculate freezing point of the solution by using the formula of depression in freezing point,i.e.,

  

, where, Tf*= 0 oC

vant's Hoff factor, i = 2 and Kf = 1.86oC/molal

Therefore option b) -8.77 oC is correct.

     

     

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
What is the normal boiling point of an aqueous solution that has a freezing point of...
What is the normal boiling point of an aqueous solution that has a freezing point of 1.04 oC. Kf for water 1.86 oC/m (oC-kg/mol). Hint: Calculate the molality from the freezing point depression and use it to calculate the normal boiling point.
Calculate the boiling point of a solution of NaCl that has a freezing point of -0.3720...
Calculate the boiling point of a solution of NaCl that has a freezing point of -0.3720 °C. Assume complete dissociation. Kf water = 1.86 °C/m Kb water = 0.512 °C/m A. 100.1 °C B. 99.1 °C C. 101.1 °C D. 98.9 °C E. 105 °C
What is the molality of NaCl formula units in an aqueous solution if the boiling point...
What is the molality of NaCl formula units in an aqueous solution if the boiling point of the solution is 102.10 °C at 1 atm. (Water has a boiling point elevation constant of 0.51 °C kg/mol.) A) 4.1 m B) 0.49 m C) 8.2 m D) 2.1 m
The boiling point of an aqueous solution is 101.77 °C. What is the freezing point? Constants...
The boiling point of an aqueous solution is 101.77 °C. What is the freezing point? Constants can be found here.
The boiling point of an aqueous solution is 101.88 °C. What is the freezing point? Constants...
The boiling point of an aqueous solution is 101.88 °C. What is the freezing point? Constants can be found here. Constants for freezing-point depression and boiling-point elevation calculations at 1 atm: Solvent Formula Kf value* (°C/m) Normal freezing point (°C) Kb value (°C/m) Normal boiling point (°C) water H2O 1.86 0.00 0.512 100.00 benzene C6H6 5.12 5.49 2.53 80.1 cyclohexane C6H12 20.8 6.59 2.92 80.7 ethanol C2H6O 1.99 –117.3 1.22 78.4 carbon tetrachloride CCl4 29.8 –22.9 5.03 76.8 camphor C10H16O...
What is the freezing point of a solution prepared by adding 50.0 g of NaCl to...
What is the freezing point of a solution prepared by adding 50.0 g of NaCl to 250. g of pure water? (Water has a kfp =1.86 oC/m)
What is the freezing point of an aqueous solution that boils at 107.4 ∘C? You may...
What is the freezing point of an aqueous solution that boils at 107.4 ∘C? You may assume that the boiling and freezing points of water are 100 ∘C and 0 ∘C, respectively
What are the freezing point and boiling point of water containing 1.00 mol of NaCl in...
What are the freezing point and boiling point of water containing 1.00 mol of NaCl in 200. g of water? How do these values change if CaCl2 is used instead of NaCl?
What is the boiling point of a solution containing 15.0 g of NaCl in 0.500 L...
What is the boiling point of a solution containing 15.0 g of NaCl in 0.500 L of water? The boiling temperature of pure water is 100.00 oC and the boiling point elevation constant of H2O = 0.5121 oC.m-1
Which aqueous solution has the lowest boiling point? 0.10 m C6H12O6 0.10 m NaCl 0.10 m...
Which aqueous solution has the lowest boiling point? 0.10 m C6H12O6 0.10 m NaCl 0.10 m AlCl3 0.10 m BaCl2
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT