Dear Ibrahim Mohammad ,

presence of salt can affect solubility of gases. Many cations and anions of salt will interact with water which affects the short-range order of water molecules and reduces the available (free) water molecules to interact with gases.

Have a look at following paper: Article Analysis of salt effects on solubility of noble gases in wat...

In order to increase the gas solubility in general you can use reverse osmosis water (use ultra-pure water).

In some cases (e.g. CO2, NH3), pH also plays an important role.

If we increase the pH, more CO2 can be dissolved and converted to HCO3- and CO32-.

OH- (aq) + CO2 (g) --> HCO3- (aq)

In order to speed up this reaction you can try and add a catalyst (e.g. carbonic anhydrase). Check out: Article Theoretical investigation of the CO2 + OH−HCO3− reaction in ...

For NH3, the opposite is true as shown in following equation:

NH3 (g) + H+ (aq) --> NH4+ (aq)

Regards, Rob.

Adjusting pH can transform CO2 into more soluble forms that will dissolve. See the carbonate equilibrium table.

https://www.sciencedirect.com/search/advanced?qs=increase%20solubility%20of%20gases%20in%20liquid&show=25&sortBy=relevance

you can use a bubble column or bubble device

Note that CO2 has acidic character when dissolves in water: (i) CO2 + H2O ⇌ H2CO3; (ii) H2CO3 + H2O ⇌ HCO3- + H3O+; (iii) HCO3- + H2O ⇌ CO32- + H3O+. If the dissolving gas has acidic character (e.g. CO2, SO2, HCl, etc.), it can be said that its proton affinity (PA) is lower than that of water. It can be then generally expected that such a gas solubility is likely to be increased by somehow alkalizing the aqueous solution dissolving the gas, since the mentioned equilibria should be displaced to the right. It may likely also increase, if another gas, yet with a proton affinity (PA) higher than that of water, hence of alkaline character (e.g. NH3) jointly dissolves with the acidic gas.

More generally; strong enough chemical affinity between the solvated species of two gases dissolving in the same solvent may favour the solubility of both gases; while for inert gases the opposite trend can be generally expected.

there are several systems used to removeindustrially co2 from a gas by increasing its solubility in water that uses this enhanced solubility to work. they are all alkaline like potassium, sodium, calcium, magnesium and amines like ethyl, diethyl and triethyl - amines and derivates. in all these sysmes CO2 reacts with the additive. For oxygen since it is a diatomic gas, it has low dissociation constant and th presence of any other substance like salt decreases its solubiility, see an interesting dicussion at: https://www.sciencedirect.com/topics/engineering/oxygen-solubility

see also

Article The Solubility of Oxygen and Ozone in Liquids

Para lograr una solubilidad de los gases, que son muy poco solubles en agua de los factores con los que se pueden trabajar experimentalmente quizás puedría ser con el pH y con un surfactante en pequeña cantidad, que permita romper la tensión superficial del agua y que los gases puedan disolverse, alguna porción baja en agua por que su Kw es muy baja.