Ch 8 Colligative_Properties

Ch 8 Colligative_Properties - Briefly explain why 6 A...

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Colligative Properties Chem 101 1. Arrange the following aqueous solutions in order of increasing vapor pressure. a. 0.35 M HOCH 2 CH 2 OH, ethylene glycol, which is a nonvolatile solute. b. 0.50 M sugar c. 0.20 M KBr d. 0.20 M Na 2 SO 4 2. Which solution is expected to have the higher boiling point in the following pairs? 0.10 M Na 2 CO 3 / 0.15 M sugar 0.30 M NH 4 NO 3 / 0.15 M NaNO 3 3. Which solution is expected to have the lower freezing point in the following pairs? 0.20 M KBr / 0.30 M sugar 0.15 M Na 2 CO 3 / 0.12 M NH 4 NO 3 4. Which solution should have the highest osmotic pressure? 0.30 M NaCl 0.08 M CaCl 2 0.25 M glucose 0.14 M Na 2 CO 3 5. You can restore the crispness of limp celery by putting it in water.
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Unformatted text preview: Briefly explain why. 6. A salt-water protozoan (single-celled organism) is placed in fresh water. Will it shrivel or burst? Briefly explain your choice. Answers to colligative properties problems: 1. d < b < c < a 2. 0.10 M Na 2 CO 3 0.30 M NH 4 NO 3 3. 0.20 M KBr 0.15 M Na 2 CO 3 4. 0.30 M NaCl 5. The inside of the celery is like a solution. The net flow of water will be into the celery through osmosis. 6. Assume that the protozoan cell solution must be isotonic with salt-water. When placed in fresh water, the net flow of water will be into the cell and eventually it will burst....
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