Worksheet: Ideal Solutions

In this worksheet, we will practice describing the properties of ideal solutions and their similarity with ideal gases.

Q1:

When KNO3 dissolves in water, the temperature of the water decreases. Is the resulting solution an ideal solution?

  • AThe dissolution is exothermic, and the resulting solution is not ideal: the enthalpy of mixing for an ideal solution must be zero.
  • BThe dissolution is endothermic, and the resulting solution is not ideal: the solute will precipitate over time in order to release heat energy from the system.
  • CThe dissolution is exothermic, and the resulting solution is ideal: dissolution of the solute is complete and ions are completely dissociated.
  • DThe dissolution is endothermic, and the resulting solution is ideal: dissolution of the solute is complete and ions are completely dissociated.
  • EThe dissolution is endothermic, and the resulting solution is not ideal: the enthalpy of mixing for an ideal solution must be zero.

Q2:

Which of the following is not a typical property of a solution?

  • ASolutions are unstable over long periods, and solutes will evaporate or precipitate out spontaneously.
  • BThe components of the solute within a solution are dispersed on the molecular level.
  • CSolutions share the physical state of the solvent, not the solutes.
  • DThe concentration of a solute can be varied continuously, up to the limit of solubility.
  • ESolutions consist of solutes dissolved in a solvent.

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