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Chapter 12: Problem 35

A beaker of water is initially saturated with dissolved air. Explain what happens when He gas at 1 atm is bubbled through the solution for a long time.

Short Answer

Expert verified
When helium gas is bubbled through a beaker of water saturated with dissolved air, the helium gas dissolves into the water displacing some of the initially dissolved air. This causes the release of the displaced gases back into the atmosphere.

Step by step solution

01

Understand the state of the water

The beaker of water is initially saturated with dissolved air. This means that the water has absorbed as much air as it can at the given temperature and pressure, and is in equilibrium with the air.
02

Introducing He gas

When He gas is bubbled through the solution, it will start to dissolve in the water. As helium is a noble gas, it does not react with the water, it just dissolves to the extent possible influenced by the temperature and pressure it is exposed to.
03

Dissolution of He gas and Release of air

Because the water was initially saturated with air, when helium gas dissolves, it displaces some of the air dissolved in the water (i.e., nitrogen and oxygen gases). As a result, these gases are released back into the atmosphere.

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