What is the solubility of oxygen in water? Give references for your answer. I saw some that said cc/gm or something like that.

2 Answers
Jun 24, 2017

Answer:

We'll try, and I see Truong-Son N. has already tried; here is another attempt......

Explanation:

I think you mean #g*cm^-3# rather than #cm*g^-1#, and the former units mean precisely the same as #g*mL^-1#. Why?

#1*cm^3=(1xx10^-2*m)^3#. Why? Because the prefix #"centi"-=10^-2#. And thus............

#1*cm^3=(1xx10^-2*m)^3=1xx10^-6*m^3#.

Sometimes I remember that #1*m^3# (which is a HUGE volume!), is #1000*L#, and that there are #10^3*cm^3# in a #L#. An equivalent term for the #"litre"# is #"cubic decimeter"#, #dm^3#.

And thus #1000*L=10^3*Lxx10^-6*m^3=1xx10^-3*m^3#.

Equivalently #1*L=1*dm^3=(1xx10^-1*m)^3=10^-3*m^3#, as required.

If I have muddied the waters, I apologize.........

Jun 24, 2017

Here's a good source.

Depends on what temperatures you want though, because this is experimentally determined.

Here's a graph based on the above reference, for the solubility of #"O"_2(g)# IN AIR in water from #0^@ "C"# to #40^@ "C"# in #0.5^@ "C"# increments at #"760 torr"# atmospheric pressure.

Oxygen in Air, Solubility in Water

For pure oxygen in water, divide the solubility by the mol fraction of oxygen in air, #0.21#:

Pure Oxygen, Solubility in Water

Here's the data for oxygen in air, in one spreadsheet page:

The units are milligrams per liter of solution for the solubility. Or, another option is that I've also converted the solubility to molarity:

#cancel"mg"/"L" xx cancel"1 g"/(1000 cancel"mg") xx "1 mol O"_2/(31.998 cancel"g") = "mol O"_2/"L soln"#

Oxygen in Air, Solubility in Water

And also the pure oxygen version:

Pure Oxygen, Solubility in Water