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Re: [APD] Estimative Index for CO2 Dosing - Bah!
gbooth at frii_com wrote:
> Someone mentioned CO2 equilibrium values. This was beat to death back in
> the 90s and the theoretical value for CO2 equilibrium was 0.485 PPM (at a
> specific temperature, etc). However wonderful that theoretical number is,
> the practical value is around 2-3 PPM. Resolution was never reached on
> why there was a difference but it was probably due to either
> A) biological respiration (bacteria, algae, plants, fish) keeping ahead of
> diffusion to the atmosphere,
> 2) the contrarian nature of aquarium water.
I'm not afraid to be wrong, so someone correct me if I am here. My
understanding of Henry's Law is that the calculation should go something
CO2: 0.0314 molar percent in the atmosphere and a solubility constant of
----------------- = 1.05x10^-5 mol/l * 44010 mg/mol = 0.464 mg/l
Oops. Last time I accidentally only moved the decimal over 4 places
instead of 5.
This is for water at 25°C (77°F), which is very near what most of us are
You could use this and 1479 mg/l as saturation to construct your own
curve with some certainty.
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