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Anonymous Poster #1

### Solubility of Gas in Liquid

10/30/2012 10:04 AM

Hi, Could you explain me the below highlighted statements which i red from "http://www.amcresidents.com/Lectures/Dr_Trickey/Solubility.htm"
Solubility.Henry's law: (1803)At constant temperature, the amount of gas dissolved in a liquid is proportional to the partial pressure of the gas with which it is in equilibrium.Solubility also depends on the specific vapor and the specific solvent.With temperature and pressure, we need to define "amount" - as in Henry's law. Although the "amount" of gas (and its activity) are directlyproportional to pressure, this refers to the number of molecules; the higher the pressure, the greater the number of molecules, but they are compressed(Boyle's law). Volume is a function only of temperature.If temperature is not constant, the amount of gas or vapor dissolved is inversely proportional to the temperature.

Ostwald solubility coefficient.

Volume of gas dissolved in unit volume at ambient temperature and pressure. In anesthetic practice, these are quoted in tables, assuming a body temperature of 37°C. Note that the volume of gas dissolved is only dependent on temperature, and not pressure (though the number of molecules and the activity of these is pressure-dependent).

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#1

### Re: Solubility of Gas in liquid

10/30/2012 11:15 AM

Correlation is not necessarily indicative of causation.

In this case, of solubility to pressure. If a liquid and a gas are progressively squeezed in a piston, the gas will dissolve more at higher pressures. But this only because of the physical need to compensate the increasing pressure and decreasing volume. The two are "forced" into each other. This doesn't mean the solubility, a property of a material, has improved. Just like in soda: the carbonation is performed at higher than atmospheric pressure to improve fusion, but when you open the can, some CO2 fizzes away.

But solubility is directly affected by temperature.

Think of pressure as a coincidental relation to temperature when analyzing solubility:

P= V x T

This is however, not saying that the solubility-pressure relation is ignored and without any practical application. In precipitation fouling of CaSO4 in oil wells, where temp-solubility is still primary, the pressure-solubility "relation" is kept track as it may affect productivity over a given time frame.

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