Oxygen diffusion in water

 

The figure shows:

      A sealed bag filled with air that is permeable to oxygen (O2), submerged in a beaker of water

      The concentrations of oxygen gas in the bag and dissolved in water

      Oxygen molecules represented by white circles

      One oxygen molecule labeled “X”

 

After the initial conditions shown above, the system rapidly reaches equilibrium where there is the same concentration of oxygen molecules on both sides of the permeable bag. Where would you predict the oxygen molecule labeled “X” would be located just before equilibrium is reached?
A. In the bag

B. In the water

C. Cannot predict

 

Explain your reasoning about where the oxygen molecule labeled “X” would be located just before equilibrium is reached.

 

Where would you predict the oxygen molecule labeled “X” would be located after equilibrium is reached?
A. In the bag

B. In the water

C. Cannot predict

 

Explain your reasoning about where the oxygen molecule labeled “X” would be located after equilibrium is reached.

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This material is based upon work supported by the National Science Foundation (DUE grants: 1438739, 1323162, 1347740, 0736952 and 1022653). Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the NSF.