Colligative properties

Lab should include

1. Title page with grading rubric attached.
2. Introduction – define melting point, boiling point and explain any phenomena that affect normal mp and bp, etc.
3. Procedure
4. Graphical data taken from Vernier setup
5. Excel spreadsheet
6. Discussion and conclusion – describe any errors that may have caused your data to be off. Give the molar mass you calculated for the unknown and compare the mw you determined to the molar mass of naphthalene and predict whether or not you believe the unknown is really naphthalene.
7. Post lab questions – these are hard. Come ask for help.

Be sure to include the lab book pages complete with procedure.

Lab Notebook		/15
Data/Log/Observations	/5
Signature and Stamp	/5
Procedure	/5
Formal Report		/85
Title Page	/2
Procedure	/5
Graphical data taken from Vernier setup	/10
Excel spreadsheet	/20
Discussion and conclusion	/10
Post lab questions	/38
Total		/100

Write up should contain

1. Title page

2. Introduction - include definition/explanation of freezing point, boiling point, freezing point depression, boiling point elevation (include information regarding colligative properties in this definition), and supercooling (What is happening when something supercools?).

3. Procedure - reference as appropriate and note changes to published procedure. (You may wish to reference experiment 9 even though we did not do it because it describes the basic experiment. Our changes primarily involved using different solvents. Don't forget to include a section describing the boiling point elevation procedure. You may be brief here.

4. Data section - include all graphs (remember to label axes and give titles)

Create a table similar to the one below for both freezing point depression and boiling point elevation data.. Show a sample calculation for all calculated values.

Possible table design--

Molality

Tfreezing

rT freezing

Experimental kf

Literature kf

% error kf

5. Discussion and Conclusions - compare experimental and literature values for k_f and k_b. Suggest possible explanations for differences.

6. Original data etc from the lab book.

7. Questions from handout.

Append the data pages from your lab book and the graphs from lab works. You might want to check and be sure you included proper labels on all of them, because I will probably ding you if you miss some labels, titles, or units.