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1. The freezing point of an aqueous solution that contains a non- electrolyte is –9.0°C.

1. The freezing point of an aqueous solution that contains a non- electrolyte is –9.0°C.

Chemistry: Matter and Change
Chemistry: Matter and Change
1st Edition
ISBN:9780078746376
Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Chapter14: Mixtures And Solutions
Section: Chapter Questions
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4. The freezing point of an aqueous solution that contains a non- electrolyte is -9.0°C. a. What is the freezing-point depression of the solution? b. What is the molal concentration of the solution?
Transcribed Image Text:4. The freezing point of an aqueous solution that contains a non- electrolyte is -9.0°C. a. What is the freezing-point depression of the solution? b. What is the molal concentration of the solution?
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Solution:- Given:- Freezing point of aqueous solution containing non-electrolyte = -9.0°C.

As, we know Freezing point of water (Tf pure solvent) = 0°C.

(a) Freezing point of solution is given by following equation:-

Tf sol = Tf pure solvent - ∆Tf 

Here, Tf sol => Freezing temperature of solution 

          Tf pure solvent => Freezing temperature of pure solvent & here water is solvent because it is given that solution is aqueous.

         ∆Tf = Depression in freezing point.

Therefore, -9.0 °C = 0.0 °C + ∆Tf

∆Tf = 9.0 °C.

9.0°C is the depression in freezing point.

 

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