I see this is one of the misconceptions, but where i cant find websites that tell explains to me that this is true.

 

Is there any websites that has an explanation about this?

In english please?

My teacher said that the concept that boiling water contains air,oxygen, or nothing is a misconception among students. He told us to go to websites (search engines) that contains proof of either is this is true or not.:scratch:

or more easier to understan : what does the boiling water bubbles contain?

it depends. if you boil it in a vacuum, then it contains nothing but water.... what else would there be in it. If you boil it in air, then naturally the steam would be a mixture of water and whatever medium you boil it in, but ultimately the boiling component of whatever you boil will only consist of water, and perhaps molecules carried from the water. note how a cup of coffee smells of just that, because it contains molecules of coffee stuff carried up in the water vapour.

Water definatly contain more than just O2.

 

If you have a glass of water sitting on the table, it will be slightly acidic, pH <7.

 

This is because it absorbes CO2 from the air to form Carbonic Acid.

 

H2O+ CO2 --> H2CO3

 

 

What was the original question? What do the bubbles in boiling water consist of? I dont understand what misconception is being discussed here - if one boils water then bubbles of steam will rise from the bottom of the beaker to the top. If theres any oxygen dissolved in the water this will come up as well, plus anything else usually.

Originally posted by w12talon

Water definatly contain more than just O2.

 

If you have a glass of water sitting on the table, it will be slightly acidic, pH <7.

 

This is because it absorbes CO2 from the air to form Carbonic Acid.

 

H2O+ CO2 --> H2CO3

 

 

 

Technically speaking, H2CO3 in water soln isn't true Carbonic Acid, but rather hydrated CO2.