Colligative properties (5/11)

Question 1

Freezing point depression

Answer 1

decrease the temperature at which the solution can freeze (must be even colder) and increase the temperature at which it boils (must get even hotter)

Question 2

Colligative properties definition

Answer 2

Do not depend on identity of solute

Depend on the total number of dissolved solute particles

Question 3

4 basic properies

Answer 3

Vapor pressure reduction
Boiling point elevation
Freezing point depression
Osmotic pressure

Question 4

Vapor pressure reduction

Answer 4

if liquid exposed to air will evaporate and this is the pressure
if adding solute, reduced evaporation liquid pressure

Question 5

Raoult’s law

Answer 5

Pvaporofsolution= Xmolefractionofsolvent*Pvaporof solvent
Molefraction= mol of solvent/moles of solvent + moles of solute

Question 6

Boiling point

Answer 6

temperature at which vapor pressure equals atmospheric pressure
adding a solute to a solution decreases vapor pressure and increases boiling point

Question 7

Boiling point elevation

Answer 7

Tb = i*Kb*m 
Kb= constant for the solvent in question 
m= molality (mol/kg)
i= how many particles generated when substance ionizes in solution

Question 8

Freezing point depression

Answer 8

Tf=iKfm
Kf water= 1.86
becomes less

Question 9

Osmotic pressure

Answer 9

Pressure required to prevent osmosis

Question 10

Vapor pressure is best reduced when

Answer 10

adding a large amount of a nonvolatile solute to the solvent