Does solubility change with pressure?

1 Answer
Nov 10, 2014

In general, the solubility of a gas in a liquid is increased by the increase of pressure.

A good way to look at this is when the gas is at higher pressure, its molecules will be colliding more frequently with each other and with the surface of the liquid. As the molecules collide more with the liquid's surface, they will be able the squeeze between the liquid molecules and thus become a part of the solution. If the pressure is decreased, the converse is true. Gas molecules will actually come out of solution. This is why carbonated beverages are pressurized. It keeps the #CO_2# in solution until you open it and keeps it tasting fresh.

It should be noted that changes in pressure will only effect the solubility of a gas solute. If the solute is a liquid or solid, there will be no change in solubility.