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CHEM 213 George Mason University Molecular Mass by Freezing Point Depression Lab Report

CHEM 213 George Mason University Molecular Mass by Freezing Point Depression Lab Report

Question Description

In this experiment we determined the molecular mass ofisopropyl alcohol (rubbing alcohol) by measuring the freezing point of an aqueous solution of thealcohol.

Distilled Water

Distilled Water + Isopropyl Alcohol

Trial One

Trial Two

Trial One

Trial Two

Volume of Distilled Water (mL)

15 mL

NOT PROVIDED

Mass of Distilled Water (kg)

Volume of Isopropyl Alcohol (g)

NOT PROVIDED

4 mL

Mass of Isopropyl Alcohol (g)

Time (sec)

Temperature

(ºC)

Temperature

(ºC)

Temperature

(ºC)

Temperature

(ºC)

0

15.9

22.1

20.7

21.6

30

13.1

19.9

12.1

12.5

60

10.5

17.0

8.0

8.2

90

8.6

14.9

4.9

4.3

120

7.5

12.2

1.6

2.4

150

6.5

9.9

-0.5

0.3

180

5.0

7.4

-2.6

-0.6

210

3.7

5.0

-4.4

-2.6

240

2.4

3.1

-4.7

-3.7

270

1.2

1.0

-6.1

-4.0

300

0.1

0.9

-6.6

-5.6

330

-0.3

1.1

-5.2

-5.1

360

0.5

1.4

-4.9

-4.7

390

0.6

1.3

-5.5

-5.2

420

0.9

0.7

-5.5

-5.1

450

0.7

0.9

-5.8

-5.7

480

1.0

0.6

-6.2

-5.4

510

0.8

0.7

-5.9

-4.9

540

1.0

0.7

-5.9

-4.5

570

1.0

0.4

-6.2

-5.1

600

0.5

-6.0

-5.1

Freezing Point (ºC)

Average Freezing Point (ºC)

?Tf(°C)

Mexp’t (moles/kg)

Moles of Isopropyl Alcohol (moles)

Molecular weight of Isopropyl Alcohol (g/mol)

% Error of Molecular Weight of Isopropyl Alcohol

– Find all of the information missing in the Data table and show your work.

– Make an Excel worksheet “Results” showing the calculated results – each in a separate row. Make sure to show an example calculation for each column on the bottom left. The columns should include:

? m_H2O = Mass of distilled water solvent

? m_Iso = Mass of Isopropyl alcohol

? dt_f = Freezing point depression

? m_expt = Molality

? Mol (Isopropyl) = Moles of isopropyl alcohol in mixture

? MW (Isopropyl) = Molecular mass of isopropyl alcohol

? % Error = Percent error

– Create an Excel chart ‘Freezing Point Determination’ with the variables time on the x-axis andtemperature on the y-axis to determine the freezing point. An example of how the chart should look like in attached below. My excel is really old so please include a picture of the graph in your submission as well as in excel.

– Answer these discussion questions:

Define the freezing point of a solution?

What may be a reason why an alcohol/water mixture does not freeze at a constanttemperature?

What are the possible sources of error in this experiment?

Please let me know if you have any questions or if you think i missed any information you might need.


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