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Natural soils are porous solids, with pore spaces that hold both water and gases. Due to...

Natural soils are porous solids, with pore spaces that hold both water and gases. Due to respiration by plants and soil bacteria, the partial pressure of carbon dioxide in soil pores can be quite high, maybe as much as 10 times greater than atmospheric CO2(g). Based on this estimate, what would be the approximate pH of water in soil pores? What effect would this pH have on carbonate minerals such as calcite that are common in soils?

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Simultaneous presence of CO​​​2 and water in the soil will produce carbonic acid as follows:

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