Lecture 3612/5/05. Colligative Properties Physical property Based on concentration of solute...

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Lecture 36 12/5/05

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Transcript of Lecture 3612/5/05. Colligative Properties Physical property Based on concentration of solute...

Page 1: Lecture 3612/5/05. Colligative Properties Physical property Based on concentration of solute molecules Doesn’t depend on identity.

Lecture 36 12/5/05

Page 2: Lecture 3612/5/05. Colligative Properties Physical property Based on concentration of solute molecules Doesn’t depend on identity.

Colligative Properties

Physical property

Based on concentration of solute molecules

Doesn’t depend on identity

Page 3: Lecture 3612/5/05. Colligative Properties Physical property Based on concentration of solute molecules Doesn’t depend on identity.

Colligative Properties

Vapor pressure depression

Boiling point elevation

Freezing point depression

Osmotic pressure

Page 4: Lecture 3612/5/05. Colligative Properties Physical property Based on concentration of solute molecules Doesn’t depend on identity.

Vapor Pressure depression

Raoult’s LawP = XsolventP°

ΔP = XsoluteP°

Page 5: Lecture 3612/5/05. Colligative Properties Physical property Based on concentration of solute molecules Doesn’t depend on identity.

Fig. 15-15, p.742

Page 6: Lecture 3612/5/05. Colligative Properties Physical property Based on concentration of solute molecules Doesn’t depend on identity.

Boiling Point elevation

ΔTb=Kbmi

m = molality = moles solute / kg solvent

Page 7: Lecture 3612/5/05. Colligative Properties Physical property Based on concentration of solute molecules Doesn’t depend on identity.

What about boiling water for pasta?Kb (water) = 0.512 °C/m

Page 8: Lecture 3612/5/05. Colligative Properties Physical property Based on concentration of solute molecules Doesn’t depend on identity.

Freezing Point Depression

ΔTf = Kfmi

Page 9: Lecture 3612/5/05. Colligative Properties Physical property Based on concentration of solute molecules Doesn’t depend on identity.

Salting the sidewalksKf (water) = 1.86 °C/m

Page 10: Lecture 3612/5/05. Colligative Properties Physical property Based on concentration of solute molecules Doesn’t depend on identity.

ethylene glycol

Coolant Pure Water50/50

C2H6O2/H2O70/30

C2H6O2/H2O

Freezing Point 0°C/32°F -37°C/-35°F -55°C/-67°F

Boiling Point 100°C/212°F 106°C/223°F 113°C/235°F

Page 11: Lecture 3612/5/05. Colligative Properties Physical property Based on concentration of solute molecules Doesn’t depend on identity.

Osmotic pressure

Π = MRTi

Page 12: Lecture 3612/5/05. Colligative Properties Physical property Based on concentration of solute molecules Doesn’t depend on identity.

Fig. 15-19, p.749

Page 13: Lecture 3612/5/05. Colligative Properties Physical property Based on concentration of solute molecules Doesn’t depend on identity.

Reverse Osmosis


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