Question

Why does oxygen dissolve in water? :O

Answer 1

The oxygen has to cross the air/water interface- often a slow process. Just how slow depends on whether the water is still or running, how much surface is in contact with the air, what's dissolved in the water, and whether any films (like soap, or broken bacteria or algae cell walls) are floating on the surface. Once the oxygen crosses the surface, it is caged by water molecules.

it should be remembered that the dissolved O2 is in very low quantity may be in ppm level :) hence there may be some week interaction between the water and O2 molecule :)

Answer 2

Oxygen will only be absorbed by cold water due to the movement and agitation of water causing the O2 molecules (and other gases) from the atmospheric air being trapped within the liquid.

Answer 3

Oxygen is super negative. Hydrogen bonding is legitly strong. So it happens. What's more impressive to me is dissolved CO2 in soda. By increasing the pressure they are literally forcing the carbon dioxide to dissolve into the liquid. Actually this gives me a good idea for an experiment.

Weigh a soda, then shake it up and slowly unscrew the top to let some of the gas out. Just keep doing this and weighing every now and then to see how much mass of carbon dioxide leaves after each shake. How much of a soda is just gas? How quickly does the carbon dioxide leave, is it more of an exponential decay? Just some interesting thoughts I guess.

Answer 4

You can even take the difference in mass from the start to beginning and find out how many moles of CO2 you had.

Answer 5

What does the process "dissolve" even mean? Breaking down?

Answer 6

No, nothing breaks. It's more like "shove in between the cracks and pack together tightly".

Answer 7

Gasses are really not put together. What makes liquids different from gasses is that the molecules have enough kinetic energy to overcome the electrostatic attractions between each other and are freely bouncing around with a LOT of free space between them. So by squeezing the volume down that they're contained in, you're really just going from something like this to this: But since those same particles are moving at the same speed and energy and have a shorter distance to go before hitting the wall this translates into more frequent hitting of the walls causing the pressure to go up.

If there's now liquid in there with it at the bottom this translates to basically meaning that squeezing something like an oxygen molecule in with the H2O (dissolving) which is rare is a lot more likely to happen since it occurs more often.