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Presentation on theme: "Solutions."— Presentation transcript:

1 Solutions

2 Vocabulary Solute Solvent Solubility Saturated Supersaturated
Unsaturated Colligative property

3 Vocabulary Aqueous Concentrated Dilute Dilution Molarity m/m percent
m/v percent

4 Vocabulary v/v percent Molality Normality Miscible Immiscible

5 Solubility How much will dissolve in a specific amount of a specific solvent at a given temperature. Typically reported as g/100 g solvent Solubility of solids and liquids increase with temperature. Solubility of a gas decreases with temperature

6 Rate of solution Solids and liquids dissolve faster when:
Temperature is increased It is shaken or stirred Solute is ground up

7 Solubility curve

8 How stuff dissolves

9 9 types of solution Solute Solvent Example Gas Gas air Liquid Gas humidity Solid Gas Gas Liquid soda Liquid Liquid vinegar, antifreeze Solid Liquid Kool Aid Gas Solid Liquid Solid Amalgam Solid Solid Alloy: Brass, steel

10 Solution states Phase of matter of final solution

11 Molarity M Moles solute per liter of solution Mol/L

12 Molality m Moles solute per kg solvent
Used with colligative properties

13 Colligative Properties
Freezing point depression Boiling point elevation Vapor pressure depression Read p Depends ONLY on the number of particles in solution, not what they are. Dissolving 1 mole of NaCl in water results in 2 moles of dissolved particles: Na and Cl

14 Freezing point depression
Calculate molality Multiply by van’t Hoff factor Multiply by freezing point depression constant (0.512 oC/m for water) Subtract from 0oC

15 Boiling point elevation
Calculate molality Multiply by van’t Hoff factor Multiply by boiling point elevation constant (1.86 oC/m for water) Add to 100oC

16 Dilutions The way that always works: determine moles, then adjust volume with water. Shortcut : Conc x volume = Conc x volume Make sure you are working in the same units Stock solution: the concentrated solution of known concentration. It is the starting point for dilutions.

17 Solution stoichiometry
Use molarity to find moles of known Use stoichiometry to find moles of unknown May have to use moles of unknown and volume to determine molarity of unknown if asked (rare)

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