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Homework Help: Solubility of gases in water

  1. Jan 21, 2016 #1


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    1. The problem statement, all variables and given/known data
    In a proper laboratory setup for collecting a gas by water displacement, which of these gases could NOT be collected over H2O because of its solubility?

    A. CO2
    B. NO
    C. O2
    D. NH3
    E. CH4

    2. Relevant equations

    3. The attempt at a solution
    I know E is definitely wrong because its organic so its insoluble in water. Water is polar so polar gases should be soluble in it, B and D are polar. Also carbon dioxide should be soluble in water because CO2 + H2O -> H2CO3. This gives me 3 gases that will be be able to be collected over water but there should only be one.

  2. jcsd
  3. Jan 21, 2016 #2


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    Science Advisor
    2017 Award

    All gasses are soluble to some extent in liquid water, but one of these molecules in particular will have very strong interactions with water molecules. Think of the potential intermolecular interactions each of these molecules would form with water.
  4. Jan 21, 2016 #3


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    Both B and D are polar but B has less difference in electronegativity so D would be the most polar so most soluble, right?
  5. Jan 21, 2016 #4


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    Staff: Mentor

    Again: think of intermolecular interactions. Just being polar is not everything.
  6. Jan 21, 2016 #5


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    Hydrogen bonding!
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