Schedule Today (3/29): Continue Chapter 17

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Presentation transcript:

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

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 350.0 torr and pure liquid B has a vapor pressure of 100.0 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?

Vapor Pressure of Solutions Consider if the solute and solvent are volatile (both contribute to the vapor pressure).

Ideal and Non-Ideal Solutions The chemical structures affect intermolecular forces, which affect the ideality of the solution.

Phase Diagram of Water Note: this phase diagram is for a closed system with no air present.

Phase Diagram of Carbon Dioxide https://www.youtube.com/watch?v=TA8zIl10-Z8

Extending the Liquid Range of Water

Boiling-Point Elevation It’s not a surface phenomenon (it is due to vapor pressure, as we’ve discussed).

Freezing-Point Depression Solids have vapor pressure too!

BP Elevation and FP Depression

Osmotic Pressure Why does this happen?

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