The boiling point elevation of the solution : ΔTb = 0.108 °C
Solution properties are the properties of a solution that don't depend on the type of solute but only on the concentration of the solute.
The term is used in the Solution properties
• 1. molal (m)
that is, the number of moles of solute in 1 kg of solvent
[tex]\tt m=\dfrac{mol~solute}{mass~1~kg~solvent}[/tex]
• 2. Boiling points
Solutions from non-volatile substances have a higher boiling point and lower freezing points than the solvent
ΔTb = Tb solution - Tb solvent
ΔTb = boiling point elevation
ΔTb = Kb. m
Kb = molal boiling point increase
m = molal solution
Given
mass alcohol = 22.2 g
mass water = 1.75 kg
Kb water = 0.512 °C/m
Required
ΔTb
Solution
mol alcohol :
= mass : MW
= 22.2 g : 60,0952 g/mol
= 0.369
molal of solution :
= 0.369 mol : 1.75 kg
= 0.211 m
The boiling point elevation :
ΔTb = 0.512 x 0.211
ΔTb = 0.108 °C
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