812 thermodynamics gas a yagas side table 162 henrys

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Unformatted text preview: 76,000 80,000 84,000 99,000 104,000 118,000 124,000 yA,liquid side Gas: A Liquid: B yA,gas side or PA,gas side -------- P or yA,liquid side yA,liquid side P A,gas side = HyA,liquid side FIGURE 1623 Dissolved gases in a liquid can be driven off by heating the liquid. Strictly speaking, the result obtained from Eq. 1622 for the mole fraction of dissolved gas is valid for the liquid layer just beneath the interface, but not necessarily the entire liquid. The latter will be the case only when thermodynamic phase equilibrium is established throughout the entire liquid body. We mentioned earlier that the use of Henry's law is limited to dilute gasliquid solutions, that is, liquids with a small amount of gas dissolved in them. Then the question that arises naturally is, what do we do when the gas is highly soluble in the liquid (or solid), such as ammonia in water? In this case, the linear relationship of Henry's law does not apply, and the mole fraction of a gas dissolved in the liquid (or solid) is usually expressed as a function of the partial pressure of the gas in the g...
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