Match the following aqueous solutions with the appropriate letter from the colum

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Match the following aqueous solutions with the appropriate letter from the column on the right.

1.0.17 mCaBr2    A.Highest boiling point
2.0.14 mFeCl3
B.Second highest boiling point
3.0.12 mAlCl3
C.Third highest boiling point
4.0.49 mGlucose(nonelectrolyte)
D.Lowest boiling point
May 28th, 2015

We need to take into account the equation for boiling point elevation:

ΔTb = Kb · bsolute · i

Where: bsolute = molality od the solution

Kb, the ebullioscopic constant, which is dependent on the properties of the solvent.

i. The Vant Hoff  factor i accounts for the number of individual particles (typically ions) formed by a compound in solution

i= 3 For CaBr2

i=4 for FeCl3

i=4 for AlCl3

i=1 Glucose

then we need to find which solution have the highest ΔTb

1) ΔTb = Kb(0.17)x(3)= 0.51Kb

2)ΔTb = Kb(0.14)x(4)= 0.56Kb

3)ΔTb = Kb(0.12)x(4)= 0.48Kb

ΔTb = Kb(0.49)x(1)= 0.49Kb

0.17 m
 CaBr2BThird highest boiling point
2.0.14 mFeCl3AHighest boiling point
3.0.12 mAlCl3DLowest boiling point
4.0.49 mGlucose(nonelectrolyte)CSecond highest boiling point

May 28th, 2015

Sorry I made a mistake in the second and third---but the letters are good

the order is


2-->A highest

3-->D lowest

4-->C third

May 28th, 2015

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