Solubility of O2 (Oxygen gas) in Water
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- čas přidán 17. 07. 2020
- In this video we'll look at the solubility of O2 in water. First we'll look at a diagram showing how Oxygen gas dissolves in water. Next we'll look at a computer animation that shows why less O2 is dissolved in water as the temperature increases.
The amount of oxygen dissolved in water is important for aquatic creatures, like fish. As temperatures increase the amount of oxygen dissolved will decrease. This limits the amount of O2 available for aquatic life.
Oxygen can enter water by agitation (shaking it up so it mixes and the O2 can dissolve more readily due to increased surface area and mixing) or by diffusion due to the random motion of gas and liquid molecules. Either way, Oxygen (O2) is soluble in water.
Hey Dr.B
I love your videos, they are concise and very well articulated. Despite getting a low number of views you keep on making videos to make Chemistry an easier subject for us all.
I just want to say on the behalf of all who watch you, Thank you and please keep on making videos
With great respect
Abraham
Thank you for the kind words and encouragement, Abraham!
This makes Chemistry fun to learn
Thanks Dr.B 👍💯
So awesome wonderful😇
My pleasure!
Amazing as always!!
Thank you!
Hey sir, does the interaction between O2 and H2O necessary is between the hydrogène of the water and the o2 molécules if so why? Another thing, can you please share the link of the animation that is used in the video ?
Question: since nitrogen gas is less "soluble" in water than oxygen gas does that mean that the dissolved gas bubbles that form when water's temperature is mainly oxygen?
Dr. B Wonderful demonstration using both graph and animation to explain how O2 reacts with water. Where do your explanations of such topics come from? Are they from students, a chem book, or just your desire to explain how "it works" from spontaneous thought? Peace David
Thanks for asking, David! For a video like this I spend time thinking about how best to explain the phenomenon visually. So I think about how I understand it, the questions I have, and then do some background research. It's a slow process but I enjoy it and always end up learning new things or thinking about the chemistry a bit differently.
@@wbreslyn Thanks for answering back Dr. B. Have much respect for you for doing these videos. Keep up the great passion. :) Peace David.
Hello good day, I had a question, how is the equation of dissolving oxygen with water, I wonder exactly in the form of an equation.
Very nicely explained sir.
Thank you!
Thanks Sir!
No problem!
Nice❤️🤗
From Sri Lanka 🇱🇰
😎
Does iron corrosion reaction happen partially with oxygen dissolved in water? (or does the oxygen come elsewhere) (I mean the cathodic reaction O_2 + 4H+ +4e- -----> 2H_2 O )
Somewhere I read that the oxygen is provided from water breaking into oxygen and H+ so I'm not sure which way to think about it :) My textbooks isn't stating it clearly enough.
Good question! Short answer is the O2 is in the water.
This discussion goes into more depth:
www.quora.com/Which-rusts-faster-iron-submerged-underwater-or-dry-iron-in-air
I like the experiment described.
Thank you sir
You're welcome!
Hello Dr.B
I just wanna ask You How does a nonpolar compound like O2 dissolve in a polar compound like water? What is the causes
I hope you answer me 🙏
O2 isn’t a polar molecule; it dissolves because the polar charges in the water molecule induce a dipole in the oxygen, making it soluble
so if I have a big air tight sealed jar with water taking up about 85% of it and close the lid so that no more oxygen gets in then how long would it take until all the oxygen in the jar runs out? I have 2 ecospheres with 2 snails in each and I close the lid when I leave for school or just when I'm gone or asleep so the snails don't for some reason escape so I hope I'm not suffocating them by leaving the jar sealed for a maximum of 10 hours straight
If you have plants and they are getting enough sunlight the ecosystem could be self sustaining. I've had this type of ecosystem for years with snails that have lasted several years without the jar being opened. Fascinating stuff!
@@wbreslyn I have one moss plant in each of my 2 ecospheres but I don't leave it under direct sunlight since I don't want the water getting too warm since the temperature should be between 65 and 83 degrees. That's great! did your snails ever get any white spots on their shells? I found out recently that if they don't have enough calcium then their shell deteriorates so I'm not sure if I should feed them calcium pellets or if the algae from the moss has calcium for them. and what does the water look like? for mine it's a reddish black which I'm assuming is because of the moss although I'm still not entirley sure if that's even good for them, the snails are moving perfectly fine and eating well but I'm still worried if the water being that color is slowly killing them
@@GoldenMarionette Agreed, direct sunlight is a problem. I didn't have problems with the snails, they were fairly small. I had elodea in the container but it died after a year or so and then there was algae (just green). My guess is the moss is fine, especially if you can see small bubbles on it every so often. That means it is producing lots of O2.
The water in my closed ecosystems stayed pretty clear. It may be that the algae is coating the sides of your container.
You might see snail eggs and that would be a good sign they are doing well (www.tropicalfishkeeping.com/attachments/limpets1johnson-jpg.269298/).
@@wbreslyn I see, i'll just wait a month then and see if their shells heal up since i just got them almost a week ago so they came with their shell slightly damaged.
Ah i see, that must be why they eat the sides of the containers a lot even though i see nothing there.
i haven't noticed any eggs but i'll definitely keep an eye out for that!
So in terms of oxygenated water, does it have to stay cold to keep the oxygen in it? What about oxygenated water on the market that gets warm during shipping? Cause I just ordered two cases of O2 water from “O2” (the brand) its great stuff so I think, it feels like it works.
Warmer water doesn't dissolve as much O2 it is an open system. In the case of oxygenated water I'm guessing it is in a sealed container. So the O2 can't escape so it doesn't need to be cold during shipping.
So the oxygen molecules don't connect to the water molecules and create h2o2? If not, how come?
Great video, explanation and content!
As simple as this might seem, I just want to make sure I have an understanding here.
Water is, in itself 2 Hydrogen and 1 Oxygen. So it inherently contains oxygen already, right?
And so the oxygen that is "absorbed" really isn't bonded to anything or it wouldn't just fly back out when the temperature increases, right? They seem to remain separate and wouldn't that technically not be soluble?
The simplest things are hard to really wrap your head around sometimes. Haha
I agree with what you're saying here but would consider O2 soluble. It does leave if you heat it up, and the O2 molecules are separate, but there are interactions between the O2 and H2O molecules (very weak but still there).
Also agreed about the simplest things being hard. These often form the cornerstone of our understanding.
@@wbreslyn ahhh, gotcha.
Thanks alot for the response and clarification!
It's all pretty miraculous in and of itself. Haha.
Have a great one!
@@wbreslyn I understand that it's a weak bond sir, could you tell me what kind of a weak bond it is? is it a hydrogen bond or something else?
@@danieljalal9347 This should help: czcams.com/video/MPzJW9pFp1A/video.html
Is the o2 still a gas when dissolved in water?
As we increase the Temperature the intermolecular bond (Van Der Walls, Hidrogen Bond) will be weak, I guess that's why the O2 seperates from the H2O molecules.
Also if we increase T, the aquos Oxigen(dissolved O2) tends to form gasous O2 (Evaporation), I guess that's why the solubility of O2 gets lower as we increase the T.
Not intermolecular bond.... It's intermolecular attraction...
When I watch the simulation I can see the there is more intermolecular attraction and hydrogen bonding between the polar water molecules. So the temperature increases the motion of the water molecules as well as the O2. The water will evaporate more with increased temp but the O2 leaves more readily as it doesn't have the attractive forces. Before I made the video I didn't really think about the role of intermolecuar forces as it relates to the solubility of gases. That's a benefit of teaching, you always come away with a deeper understanding yourself!
@@wbreslyn Thanks sir, u also teached me a lot!
That make me worry, global warming's effect on ocean's oxigenation, 02 solubility drops down a lot increasing temperature ...although I always thought that solubility increased with Temperature, in chemistry class we never spoke about gas solubility but it's kinda logic now that i think about it a gas don't act like a ionic compound
Sir hydrogen bond teach please
Here you go!
czcams.com/video/aZ8JxFwR_nY/video.html