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Originally Posted by unirdna
At 25C, saturation of CO2 is .15g/100ml water. That is 1500ppm!
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For those that might be confused because the paper I linked to suggests 622ppm and Henry's Law suggests 1500ppm, there is an explanation. The 622ppm was a figure meaning, "622 molecules of CO2 and 999,378 molecules of water." When we use the figure in our aquariums, we are using mg/L. The 622 figure works out to 1519 mg/L.
I feel compelled to point out that I took this data from the wrong table in the report, and the actual value is 0.000609 mole fractions - that is closer 1,488 mg/L for CO2 saturation at 25C.