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. Thanks!