Colligative Properties Worksheet II



Colligative Properties Worksheet II

 

1.  For a 0.222 m aqueous solution of sucrose, C12H22O11, What is the boiling point?

 

 

2. What is the normal boiling point of a 0.122 m aqueous solution of KI?

 

3.    Automotive antifreeze consists of ethylene glycol, C2H6O2 , a nonvolatile nonelectrolyte. Calculate the boiling point and freezing point of a 25.0 mass percent solution of ethylene glycol in water.

 

4.    Calculate the freezing point of a solution containing 0.600 kg of CHCl3 and 42.0 g of eucalyptol ( C10H18O), a fragrant substance found in the leaves of eucalyptus tree. Κf for CHCl3 is 4.68 0c/molal and normal freezing point is -63.5°C.

5.    List the following aqueous solutions in order of their expected freezing points: 0.050 m CaCl2; 0.15 m NaCl; 0.10 m HCl; 0.050 m HC2H3O2; 0.10 m C12H22O11

6.    “ solution of an unknown nonvolatile nonelectrolyte was prepared by dissolving 0.250 g in 40.0 g CCl4. The normal boiling point of the resultant solution increased by 0.3570C. Calculate the molar mass of the solute. Kb= 5.02° c/molal

7.    Camphor, C10H16O, melts at 179.8 o C, it has particularly large freezing point depression constant, Kf = 400C/mol. When 0.186 g of an organic substance of unknown molar mass is dissolved in 22.01 g of liquid camphor, the freezing point of the mixture is found to be 176.7 0C. What is the approximate molar mass of the solute? Τf’ 179.8° C and Kf= 40 °C/molal

Colligative Properties Worksheet Answers

 

1) 1)      100.11 °C

 

2) 2)      100.12 °C

 

3) 3)      boiling point = 102.8 °C

freezing point = -10 °C

 

4) 4)      Use the following info:

Kf = 4.68 °C/m

Normal F.P = -63.5 °C

 

 

5) 5)      NaCl, HCl, CaCl2, C12H22O11, HC2H3O2

 

6) 6)      Use the following info:

Kb = 5.02 °C/m

 

 

 

 

7) 108 g/mol

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-65.6 °C

87.9 g/mol

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