Chemical Engineering Thermodynamics

If the heat of solution of an ideal gas in a liquid is negative, then its solubility at a given partial pressure varies with the temperature as_____.

  • A. Solubility increases as temperature increases
  • B. Solubility increases as temperature decreases
  • C. Solubility is independent of temperature
  • D. Solubility increases or decreases with temperature depending on the Gibbs free energy change of solution
Answer: Option B.
Explanation: 

The effect of temperature on the solubility of a gas in a liquid:
According to Charles’s law, volume of a given mass of a gas increases with increase in temperature. The volume of given mass of dissolved gas in solution also increases with increase of temperature. It becomes impossible for solvent to accommodate gaseous solute in it and gas bubbles out. Hence, with increase in temperature, the solubility of a gas in a liquid decreases.

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