What do you believe was the most difficult part of the experiment? Molecular Weight Determination by Freezing Point DepressionObject:Determine the molecular mass of an unknown sample.Procedure:Add about 6 g of the solvent t-butanol to a test tube.Note – (Ks= 9.1°C/m)1.2.Place the test tube containing the t-butanol in a cold-water bath.3.Stir the liquid with a thermometer to determine the temperature in which t-butanol freezes.Do this twice using the same sample.4.Remove the test tube from the cold water bath and add about 0.4 g of the unknown sampleto the liquid t-butanol. Make sure the unknown sample dissolves completely.5.Repeat steps 2 and 3 with the test tube containing t-butanol and the unknown sample.Data:Mass of solvent (t-butanol)Freezing temperature of solvent°C°CMass of the unknown samplegFreezing temperature of the solution°C°CResults:Change in freezing temperature (AT;)°C°CMolality (m) of unknown solutionmmMolecular mass of unknown sample_g/mole_g/mole

Answered: What do you believe was the most…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

What do you believe was the most difficult part of the experiment?

Molecular Weight Determination by Freezing Point Depression
Object:
Determine the molecular mass of an unknown sample.
Procedure:
Add about 6 g of the solvent t-butanol to a test tube.
Note – (Ks= 9.1°C/m)
1.
2.
Place the test tube containing the t-butanol in a cold-water bath.
3.
Stir the liquid with a thermometer to determine the temperature in which t-butanol freezes.
Do this twice using the same sample.
4.
Remove the test tube from the cold water bath and add about 0.4 g of the unknown sample
to the liquid t-butanol. Make sure the unknown sample dissolves completely.
5.
Repeat steps 2 and 3 with the test tube containing t-butanol and the unknown sample.
Data:
Mass of solvent (t-butanol)
Freezing temperature of solvent
°C
°C
Mass of the unknown sample
g
Freezing temperature of the solution
°C
°C
Results:
Change in freezing temperature (AT;)
°C
°C
Molality (m) of unknown solution
m
m
Molecular mass of unknown sample
_g/mole
_g/mole

Expert Solution

Step 1-Introduction

The colligative properties deal with the modification of the properties that pertain to the solvent due to the existence of non-volatile solute. The properties that undergo changes include depression in freezing point, increase in the boiling point value, lowering the value of vapor pressure, and the osmotic pressure of the solvent.

The freezing point ( $T_{F}$ ) is the temperature at which the change in the phase such as liquid to solid of a substance is observed. The presence of a non-volatile solute in the solution reduces the magnitude of $T_{F}$ than the value of the pure solvent.