- #1
nbcromp1
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- 1
I have a sealed vessel, it is 200 ml, it contains 25 ml of water which is then saturated with CO2 (bubbled through at 0.3 l/min unitil pH drops, ~ 1 h) at rt. The vessel is then heated to 130 °C. I wish to calculate the final pressure of the system.
Thus far I have calculated the volume of CO2 in the water using NIST solubility values.
I believe the total pressure of the system to be P= PsatW + Po + Pn + Pco2.
The saturation pressure of water is calculated using the Antonine equation
Then the partial pressures of oxygen, nitrogen and CO2 are calculated using the ideal gas eq.
However, I am not sure whether I can apply the ideal gas equation to the dissolved CO2.
Additionally I am not including Henry's Law to account for air dissolved in water as I am assuming the solution is saturated(or near enough) with CO2.
Is there another way of doing this? Does anyone know how to account for the dissolved CO2?
Thanks in advance
Thus far I have calculated the volume of CO2 in the water using NIST solubility values.
I believe the total pressure of the system to be P= PsatW + Po + Pn + Pco2.
The saturation pressure of water is calculated using the Antonine equation
Then the partial pressures of oxygen, nitrogen and CO2 are calculated using the ideal gas eq.
However, I am not sure whether I can apply the ideal gas equation to the dissolved CO2.
Additionally I am not including Henry's Law to account for air dissolved in water as I am assuming the solution is saturated(or near enough) with CO2.
Is there another way of doing this? Does anyone know how to account for the dissolved CO2?
Thanks in advance