1. Colligative Properties of Solutions Chemistry Honors

2. How do you get from this…

3. …to this?

4. Add an ionic compound!

5. Colligative Properties Properties that depend only on the number of solute particles and not on their identity.

6. Some Colligative Properties are: Boiling point elevation Freezing Point depression Vapor pressure lowering

7. Effects of solute on properties of water The particles of solute are surrounded by and are attracted to particles of solvent. Now the solvent particles have less kinetic energy. The presence of solute particles interferes with crystalline lattice formation of solid ice.

8. Ionic vs Molecular Solutes Ionic solutes produce two or more ion particles in solution. They affect the colligative properties proportionately more than molecular solutes (that do not ionize). The effect is proportional to the number of particles of the solute in the solution.

9. How many particles do each of the following give upon solvation? NaCl- 2 particles Na +1 and Cl -1 CaCl 2- 3 particles, 1 Ca and 2 Cl -1 ions Glucose- one particle only, one molecule of glucose (glucose is covalent compound not an ionic compound)