1. Schedule Today (3/27): Continue Chapter 17
Should have read through 17.5
Friday (3/29): Continue Chapter 17
Read through 17.7
Monday (4/1): Finish Chapter 17
Wednesday (4/3): Start Chapter 11

2. Vapor Pressure of Solutions
The arrows show the net result. Why is this happening?

3. Vapor Pressure of Solutions
Note that the rate of evaporation of pure water is greater than the rate of evaporation of water from the solution. Why?

4. Vapor Pressure

5. Vaporization of Water
It is not a surface phenomenon (the water vaporizes in the bubbles).

6. Vapor Pressures of Different Liquids

7. Vapor Pressure of Different Liquids
Vapor pressure increases with temperature. At what temperature is vapor pressure equal to 1 atm?

8. Vapor Pressure of Solutions
How will the vapor pressure of a solution compare to that of pure water?

9. Pure Water vs. Aqueous Solution
For a given volume of bubble, how do the pressures compare?

10. Vapor Pressure of Solutions
Vapor pressure is a colligative property (ideally depends on the concentration of particles in solution, not their identities).

11. Raoult’s Law Question
Table sugar (sucrose; C12H22O11) has a solubility of 211.4g in 100.0g of water. If pure water has a vapor pressure of 23.8 torr at 25°C, determine the vapor pressure of a saturated solution of sucrose at 25°C. Table salt (NaCl) has a solubility of 36.23g in 100.0g of water. If pure water has a vapor pressure of 23.8 torr at 25°C, determine the vapor pressure of a saturated solution of NaCl at 25°C.

12. Raoult’s Law Question
You have a solution of two volatile liquids, A and B (assume ideal behavior). Pure liquid A has a vapor pressure of torr and pure liquid B has a vapor pressure of torr at the temperature of the solution. The vapor at equilibrium above the solution has double the mole fraction of substance A as the solution does. What is the mole fraction of liquid A in the solution?