Understanding Solutions and Concentration Units

Explore the world of solutions, the role of solvents and solutes, why solutions form, different concentration units like molarity and molality, calculations involved, colligative properties such as vapor pressure lowering, and how Raoult's Law explains changes in boiling and freezing points in solutions.

• Solutions
• Concentration Units
• Colligative Properties
• Raoults Law
• Solvent

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1. Solutions Homogeneous Mixture of 2 or more Substances

2. Some Terminology Solvent The substance that does the dissolving Solute The substance that gets dissolved Solution The resulting mixture

3. Why Do Solutions Form?

4. Why Isnt Everything Soluble in Everything?

5. Some Concentration Units Molarity - # mol solute / # L solution Molality - # mol solute / # kg solvent Mole Fraction of substance - # mol / total mol Mass Percent of Solute 100% (solute mass / solution mass)

6. Time to do some calculations! Calculation of concentration units Conversion of one concentration unit to another

7. Colligative Properties Vapor Pressure Lowering Boiling Point Elevation Freezing Point Depression Osmotic Pressure

8. Why Does a Solute Lower Vapor Pressure?

9. Solute Reduces Rate of Evaporation

10. Equilibrium Reestablished at Lower Pressure

11. Raoults Law

12. Why Does Vapor Pressure Lowering Change the Boiling and Freezing Points?

13. Raoults Law Applied to Two Volatile Components in a Solution