Colligative Properties

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Colligative Properties

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Presentation transcript:

Colligative Properties Chapter 18.3-18.4

Colligative Properties depend only on the number of dissolved particles in solution and not on their identity Remember how to break Compounds into their ions!

List the Colligative properties from the video!

Ion Formation Practice Break the following compounds into ions and identify how many particles there are! NaCl Na+ + Cl- BaI2 Ba2+ + 2I- AlF3 Al3+ + 3F- C6H12O6 C2H5OH

Vapor Pressure Lowering As solute increases vapor pressure decreases

Boiling Point Elevation As solute increases boiling point increase! Why? Solute decreases vapor pressure It will take more energy for the vapor pressure to equal atmospheric pressure So… You have to add more heat to get the solution to boil!

Freezing Point Depression As solute increases freezing point decreases Why? When substances freeze they form an orderly pattern When there are solutes in solution they disrupt the pattern So… You must remove more heat to freeze a solution