Match the following aqueous solutions with the appropriate letter from the column on the right. Solution ?T b = K b · b solute · i Where: bsolute = molality of the solution K b , 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 FeCl 2 i=3 for CuI 2 i=3 for ( NH 4 ) 2 S i=1 sucrose then we need to find which solution have the highest ?Tb 1 FeCl 2 ; Highest boiling point ?Tb = Kb(0.15)x(3)= 0.45 Kb 2) CuI 2 Second highest boiling point ?Tb = Kb(0.14)x(3)= 0.42 Kb 3) ( NH 4 ) 2 S Third highest boiling point ?Tb = Kb(0.12)x(3)= 0.36Kb 4) Sucrose Lowest boiling point ?Tb = Kb(0.40)x(1)= 0.40Kb .

1. Match the following aqueous solutions with the appropriate letter from the column on the
right.
1. 0.15 m FeCl 2 A. Highest boiling point
2. 0.14 m CuI 2 B. Second highest boiling point
3. 0.12 m (NH 4 ) 2 S C. Third highest boiling point
4. 0.40 m Sucrose (nonelectrolyte) D. Lowest boiling point
Solution
?T b = K b · b solute · i
Where: bsolute = molality of the solution
K b , 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 FeCl 2
i=3 for CuI 2
i=3 for ( NH 4 ) 2 S
i=1 sucrose
then we need to find which solution have the highest ?Tb
1 FeCl 2 ; Highest boiling point
?Tb = Kb(0.15)x(3)= 0.45 Kb
2) CuI 2 Second highest boiling point

2. ?Tb = Kb(0.14)x(3)= 0.42 Kb
3) ( NH 4 ) 2 S Third highest boiling point
?Tb = Kb(0.12)x(3)= 0.36Kb
4) Sucrose Lowest boiling point
?Tb = Kb(0.40)x(1)= 0.40Kb