Question

Under what conditions of temperature and pressure is a gas most soluble in water?

Answer 1

Solubility is the property of a material termed solute in a solid, liquid or gas-dissolving chemical in a solid, liquid or gas solvent. The solubility of a material depends essentially on the physical and chemical characteristics of the solvent and solvent and on the temperature, pressure and presence of other substances in the solution (including variations in pH).

Complete answer
Effect of temperature
Solubility in a liquid solvent often rises as temperature increases. For instance, more sugar is dissolved in warm water than in cold water. Solubility rises with temperature rise in the endothermic process. Solubility reduces with a rise in temperature through exothermic reaction.
You know why when water is boiling, it is bubbling? Liquid gas solubility decreases with temperature rise. Water usually includes oxygen dissolved. The solubility of oxygen in water reduces as the water is heated, such that oxygen flows into bubbles.
Aquatic creatures dwell in cold locations more, as the water in cold areas has more dissolved oxygen. This demonstrates that oxygen solubility is relatively low in water.
Pressure Effect
Only in the event of liquid solubility of a gas, the pressure effect is observable. The solubility of a liquid gas rises when the pressure is increased.
Carbonated drinks are frequent instances of liquid gas solubility. Soft beverages, home cleanser with aqueous ammonia solution, formalin aqueous formaldehyde solution, etc.
Henry's law provides for the impact of pressure on the solubility of the liquid gas. The solution of a gas in a liquid is exactly proportional to the gas pressure on the solution at a given temperature.

Note:
A substance's solubility is a completely separate attribute of how quickly it dissolves from the rate of solution. The smaller a particle, the faster it dissolves, however this generalisation may be supplemented by numerous factors. In the fields of chemistry, geochemistry, inorganic, physical, organic and biochemistry, solubility is crucial. In any event, it is directly related to its solvents and solutes, depending upon physical circumstances (temperature, pressure and concentration) and enthalpy and entropy. Water, which is a solvent for most ionic compounds and also for a variety of organic molecules, is by far the most common solvent in chemistry.