Internet Activity on FP Depression and BP Elevation. Date

Chemistry Name:

Internet activity on FP depression and BP elevation. Date:

A. go to http://group.chem.iastate.edu/Greenbowe/sections/projectfolder/flashfiles/propOfSoln/colligative.html

B. Complete the following table for the solutes listed on the webpage:

Table 1-1: Solute Table

Solute / Electrolyte or nonelectrolyte? / Ionic or molecular? / No of ions formed when dissociating in water (if any)
Sucrose (C12H22O11)
Sodium chloride (NaCl)
Calcium chloride (CaCl2)
Sulfur (Sx)

C. Complete the following table

1. Choose a solvent and a mass of the solvent and record it below (in kg).

2. Choose an ionic solute and a mass of the solute and record it in the table below(in grams).

3. Calculate the number of moles of the solute

4. Determine the freezing point of the solution by clicking the “Cold” toggle position and then the “Start” button.

5. Record the normal freezing point of the solvent (found in the box that appears when you hit “start.”)

6. Calculate the expected freezing point and record this in the table below. Show your work below.

7. Calculate and enter the percent error between the observed and calculated (theoretical) values.

Table 1-2 Freezing point of an ionic solute.

Solvent 1
______/ Solute______/ Observed freezing point / Calculated freezing point / Percent error

Mass chosen (g) / Calculated no. of moles
Mass: ______Kg

Normal freezing point of the solvent: ______

Difference in freezing point between the pure solvent and your solution: ______

D. Repeat the above for the boiling point of the same ionic solute (you can use the same mass of solvent and solute to save time.)

1. Click the reset button, click the toggle button to “hot” and click start.

2. Record the normal boiling point of the solvent (found in the box that appears when you hit “start.”)

3. Calculate the expected boiling point and record this in the table below. Show your work below.

4. Calculate and enter the percent error between the observed and calculated (theoretical) values.

Table 1-3 Boiling point of an ionic solute.

Solvent 1
______/ Solute______/ Observed boiling point / Calculated boiling point / Percent error

Mass chosen (g) / Calculated no. of moles
Mass: ______Kg

Normal boiling point of the solvent: ______

Difference in boiling point between the pure solvent and your solution: ______

E. Repeat the above for the freezing and boiling points of a molecular (nonelectrolyte) solute (you can use the same mass of solvent and solute for each to save time.)

Calculations:

Table 1-4 Freezing point of a molecular (nonelectrolyte) solute.