Colligative Properties Worksheet

 

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  1. What is a colligative property?

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  2. What are three examples of colligative properties?

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  3. How does adding a solute affect the boiling point of a solvent?

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  4. How does adding a solute affect the freezing point of a substance?

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  5. What is osmotic pressure?

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    1. What does isotonic mean?

     

     

  6. What is the Van’t Hoff Factor?

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  7. What is the equation for determining the

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    1. Boiling Point Elevation

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    2. Freezing Point Depression

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    3. Osmotic Pressure

     

     

  8. Glycerin (C3H8O3) is a nonvolatile liquid.  What is the vapor pressure of a solution made by adding 164 g of glycerin to 338 mL of H2O at 39.8°C?  The vapor pressure of pure water at 39.8°C is 54.74 torr and its density is 0.992 g/cm3.

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  9. At a certain temperature the vapor pressure of pure benzene (C6H6) is 0.930 atm.  A solution was prepared by dissolving 10.0 g of a non-dissociating, nonvolatile solute in 78.11 g of benzene at that temperature.  The vapor pressure of the solution was found to be 0.900 atm.  Assuming that the solution behaves ideally, determine the molar mass of the solute.

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  10. A solution is prepared by dissolving 27.0 g of urea [(NH2)2CO], in 150.0 g of water.  Calculate the boiling point of the solution.  Urea is a
    non-electrolyte.    kb=0.51 (°C kg)/mol.

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  11. What mass of glycerin (C3H8O3), a nonelectrolyte, must be dissolved in 200.0 g of water to give a solution with a freezing point of -1.50°C?

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  12. Consider the following

    0.010 m Na3PO4 in water 

     

    0.020 m CaBr2 in water.

     

    0.020 m KCl in water

     

    0.020 m HF in water (HF is a weak acid)

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    1. Assuming complete dissociation of soluble salts, which solution(s) would have the same boiling point as 0.040 m C6H12O6 in water? (non-polar electrolyte).

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    2. Which solution would have the largest freezing point depression?

     

     

  13.  From the following :

    pure water

     

    solution of C6H12O6 (χ = 0.01) in water

     

    solution of NaCl (χ = 0.01) in water

     

    solution of CaCl­2 χ = 0.01) in water

    Choose the one with the following:

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    1. Highest freezing point

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    2. Lowest freezing point

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    3. Highest Boiling Point

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    4. Lowest Boiling Point

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    5. Highest Osmotic Pressure

     

     

  14. Determine the boiling point for a solution of 20.0 g of NaCl and 40.0 g CaF2 in 1.00 L of H2O.  The Kb for water is 0.51 oC kg/mol and the density equals 1.00 g/cm3.

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