The vapor pressure lines for pure as well as solutionsof different concentrations are shown. Which line represents pure water?
Correct answer: A. 1
- A. 1
- B. 2
- C. 3
- D. 4
Explanation
Pure water (with the highest vapor pressure) will boil at the lowest temperature.Boiling occurs when vapor pressure = external pressure.Since pure water already has a higher vapor pressure, it reaches that point sooner - i.e., at a lower temperature
This question appeared on the UHS MDCAT 2014 paper, which you can sit online with every answer explained.
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About Colligative Properties
Colligative properties depend on the number of dissolved particles rather than their chemical identity. The topic covers relative lowering of vapour pressure, elevation of boiling point, depression of freezing point and osmotic pressure, including electrolyte dissociation, the van’t Hoff factor and molar-mass calculations.
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