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Solutions

Solutions. Homogeneous Mixture of 2 or more Substances. Some Terminology. Solvent – The substance that “does the dissolving” Solute – The substance that “gets dissolved” Solution – The resulting mixture. Why Do Solutions Form?. Why Isn’t Everything Soluble in Everything?.

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Solutions

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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 Isn’t 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. Raoult’s Law

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

  13. Raoult’s Law Applied to Two Volatile Components in a Solution

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