8.17. (Courtesy of Dan Giammar). To mitigate CO2 emissions to the atmosphere, so

Question

8.17. (Courtesy of Dan Giammar). To mitigate CO2 emissions to the atmosphere, some have sugge sted injecting CO2 into deep groundwater. A groundwater initially at pH 8.3 with an alkalinity of 1 × 10-2 M will have CO2 injected until the groundwater comes to equilibrium with Pco = 10 bar. Before adding the CO2, the groundwater behaves as a closed system. (a) What is the total inorganic carbon (Cr) of the groundwater before CO2 injection? (b) What are the alkalinity, total inorganic carbon (Cr), and pH of the groundwater after equilibration with the injected Pco,?

Explanation / Answer

a)Total number of inorganic carbon: we have no Carbon yet in this problem , so no calculation is needed for it.

b) Alkalinity: concentration of (CO2) + (H2O) + (OH-) - (H+) :H+=5.011 OH-=1*10^-2 H2O=1

pH=8.3

pH=-log[H+]

8.3=-log[H+]

-8.3=log[H+]

[H+]=antilog -8.3=5.01187

ii)CT: (CO2) + (H2O) + (CH4) + 2(O2)

After equilibrium with injected Pco2
ii)-pH=-log[H+]

pH=-log[5.011]

pH=7

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