Yes. NH3 (ammonia gas) is quite soluble in water and forms NH4OH (ammonium hydroxide). Commercially available ammonium hydroxide is 28%. It off-gases NH3 quite readlily and has a strong odor.

Thank you for your replay. I am not very good in Chemistry, and I do not understand some processes of absorption in standard machines.

Absorption chillers do mixture H2O at 320ºK with NH3 from the evaporator at 250ºK. They use ambient temperature (300ºK) to extract the heat from the absorber (exothermal). If the temperature of the mixture is lower than ambient, how can heat be extracted?

I am not a refrigeration guy, and don't know the specifics of the cooling cycle. I would imagine there is considerable heat of mixing when the 320K water mixes with the 250K NH3, and the resulting temperature becomes considerably above ambient.

Thanks, just one more question if you don't mind.

According to Henry's law, the solubility of a gas in a liquid is proportional to the pressure of that gas above the liquid.

The Dalton's law of partial pressure applies for H2O? I mean in a vessel with H2O and water they will have different partial pressures?

i mean H2o and gas

Yes . Unlike solids, gases are more soluble when the water temperature is lower .

The concentration of gases over a liquid mixture of gases should be described by the laws you quote. That is: the molar concentration of material A (ammonia) in the aqueous solution times the vapor pressure at that temperature should give the molar (or volume but not weight) concentration in the vapor phase.

The water concentration in the vapor phase (volume or molar) should be the molar concentration of water in the liquid times the vapor pressure of water at that temperature.

BUT

Water and ammonia are both very polar and "attract each other" in the liquid more than expected and the laws are bent. Don't count on them for accuracy or estimation. The answer to your questions is well documented by real data and in many refrigeration, chemistry, and engineering texts. Start with Perry's Chem Eng Handbook. You will need temperature and concentration of one phase to find the other.

Hope this was not confusing.

Yes, contact of ammonia saturated gases with water is a standard method for removal of the ammonia from these gases. Ammonia is very soluble in water. If ammonia gas is inside a sealed vessel and water is then introduced into the vessel, a vacuum will form in the vessel. There have been cases of collapsing of tanks industrially when this has happened inadvertently.

Thanks for your comments. They helped. Can you guys take a look to my post, if you don't mind: http://cr4.globalspec.com/thread/39216/Two-phase-ejector-engine

And a promise is a promise, if I get a grant to build it, I will pay a trip to all active contributors to meet, somewhere nice in the world.