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1.11: Colligative Properties

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    1. A solution contains 75 mmol/L of NaCl and 100 mmol/L of glucose. What would be its freezing point?:
      1. -0.326°C
      2. -0.465°C
      3. -0.512°C
      4. -0.651°C
      5. -0.930°C
    2. A urine sample has a freezing point of -0.83°C. What is its osmolarity?:
      1. 224.1 mosmoles/L
      2. 224.1 osmoles/100 ml
      3. 446.1 mosmoles/L
      4. 446.1 osmoles/100 ml
      5. 892.4 osmoles/100 ml
    3. Choose the solution that has a freezing point closest to that a 300 milliosmolar solution of glucose:
      1. 100 millimolar ZnCl2
      2. 150 millimolar maltose
      3. 300 millimolar NaCl
      4. 100 millimolar ZnSO4
      5. 150 millimolar Ba(OH)2
    4. A mole of which of the following substances equals 1 osmole of the same substance?
      1. NaHCO3
      2. NaCl
      3. K2HPO4
      4. glucose
      5. Ba(OH)2
    5. The calculated osmolality of serum with Na = 139 mmol/L, Cl = 101 mmol/L, K = 4 mmol/L, glucose =1300 mg/L, and BUN = 140 mg/L,
      1. 256
      2. 270
      3. 280
      4. 290
      5. 300

    Use the following Key to answer Questions 6-9:

    1. 1, 2 and 3 are correct
    2. 1 and 3 are correct
    3. 2 and 4 are correct
    4. only 4 is correct
    5. all are correct
    1. The measurement of osmolarity is based upon what principle(s)?:
      1. vapor pressure decrease
      2. viscosity
      3. freezing point depression
      4. specific gravity
    2. As the osmolality of a solution increases, which of the following occur(s)?:
      1. osmotic pressure increases
      2. vapor pressure decreases
      3. freezing point decreases
      4. boiling point decreases
    3. Osmotic pressure is:
      1. not measurable by how much the vapor pressure changes
      2. equal to number of solvent molecules times a factor
      3. measurable by how much it raises the freezing point of water
      4. proportional to concentration of solute particles
    4. The presence of unmeasured solutes in serum can be determined by:
      1. increased osmolality
      2. decreased osmolality
      3. measured osmolality significantly less than calculated osmolality
      4. measured osmolality significantly greater than the calculated osmolality
    Answer
    1. b (p. 267,269)
    2. c (p. 269)
    3. a (p. 267, 269)
    4. d (p. 267)
    5. d (p. 267)
    6. b (p. 269)
    7. a (p. 269)
    8. d (p. 267-269)
    9. d (p. 267)

    1.11: Colligative Properties is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts.

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