July 12, 2020, 03:26:37 AM
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Topic: pH after removing CO2 from groundwater.  (Read 608 times)

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Offline sophiefell

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pH after removing CO2 from groundwater.
« on: November 07, 2019, 12:51:47 PM »
Groundwater containing 60 mg/L of CO2 at 10oC is pumped through a spray nozzle aerator, and the CO2 concentration is reduced to 5.6 mg/L. If the alkalinity of the water is 200 mg/L as CaCO3, and the initial pH is 6.93, what is the pH of the water after CO2 removal? Assume the water temperature remains at 10oC and that ionic strength corrections can be neglected.

I know from the table seen here, http://agrilifecdn.tamu.edu/fisheries/files/2013/09/SRAC-Publication-No.-464-Interactions-of-pH-Carbon-Dioxide-Alkalinity-and-Hardness-in-Fish-Ponds.pdf, that I am expecting a pH of just under 8, and know that the alkalinity wont change but that decreasing CO2 will decrease acidity, therefore becomes more basic.

Would appreciate any guidance in solving

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